Water treatment agent composition and water treatment method

Abstract

The present invention provides a water treatment agent composition comprising water, a fluorescent substance which is a tracer substance, and a specific slime inhibitor, and having good stability, as well as a water treatment method using the water treatment agent composition. [Solution] A water treatment agent composition comprising water, a fluorescent substance, and at least one of isothiazolone compound, 2,2-dibromo-2-nitroethanol, and 2-bromo-2-nitropropane-1,3-diol as a slime inhibitor, wherein the pH is less than 1.

Description

[Technical Field]

[0001] The present invention relates to a water treatment agent composition and a water treatment method using the water treatment agent composition. [Background technology]

[0002] Water treatment agent compositions used in water systems such as cooling water systems contain various slime inhibitors, scale inhibitors, and corrosion inhibitors to suppress biofouling, scale, and corrosion. To obtain the optimal effect of such water treatment agents, and to reduce costs and environmental impact, it is desirable to measure the concentration of water treatment agents in the water system and control the amount added. One method for doing so is to add a reference substance, a so-called tracer substance, to measure the change in water treatment agents over time.

[0003] For example, fluorescent substances are known as tracer materials, and the concentration of water treatment agents in aqueous systems is controlled by a fluorescent tracer method using a fluorescent sensor (for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2011-203031 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, it has been found that attempting to incorporate a fluorescent tracer substance and a specific slime inhibitor into a single formulation can result in precipitation, turbidity, and low stability.

[0006] The object of the present invention is to provide a water treatment agent composition comprising water, a fluorescent substance which is a tracer substance, and a specific slime inhibitor, and having good stability, and a water treatment method using the water treatment agent composition.

Means for Solving the Problem

[0007] The present invention relates to a water treatment agent composition comprising water, a fluorescent substance, and at least one of an isothiazolone compound, 2,2-dibromo-2-nitroethanol, and 2-bromo-2-nitropropane-1,3-diol as a slime inhibitor, and having a pH of less than 1.

[0008] In the water treatment agent composition, it is preferable to further contain at least one of a scale inhibitor and a corrosion inhibitor.

[0009] In the water treatment agent composition, it is preferable to contain at least one of benzotriazole and tolyltriazole as the corrosion inhibitor.

[0010] The present invention is a water treatment method for performing water system treatment using the above water treatment agent composition.

Advantages of the Invention

[0011] In the present invention, it is possible to provide a water treatment agent composition containing water, a fluorescent substance as a tracer substance, and a specific slime inhibitor, and having good stability, and a water treatment method using the water treatment agent composition. <00001​​​​​​​​​​

[0014] The inventors have found that in a water treatment agent composition comprising water, a fluorescent substance as a tracer material, and a specific slime inhibitor, setting the pH to less than 1 reduces the likelihood of precipitation and turbidity during storage, resulting in improved stability of the composition. In particular, they have found that in a water treatment agent composition comprising water, at least one of benzotriazole and toltriazole as a corrosion inhibitor, a fluorescent substance as a tracer material, and at least one of isothiazolone compounds, 2,2-dibromo-2-nitroethanol, and 2-bromo-2-nitropropane-1,3-diol as a slime inhibitor, setting the pH to less than 1 reduces the likelihood of precipitation and turbidity during storage, resulting in improved stability of the composition.

[0015] There are no particular restrictions on the type of water used, but examples include pure water and ultrapure water.

[0016] A scale inhibitor may be added to the water treatment agent composition. Examples of scale inhibitors include polymers such as acrylic acid polymers and maleic acid polymers, as well as phosphonic acid compounds and polymerized phosphoric acid.

[0017] Examples of polymers include polymers containing monomer units of formula (1), copolymers containing monomer units of formula (1) and monomer units of formula (2), polymers containing monomer units of formula (3), and copolymers containing monomer units of formula (1) and monomer units of formula (3). Examples of polymers include homopolymers containing monomer units of formula (1), binary copolymers containing monomer units of formula (1) and monomer units of formula (2), and ternary copolymers containing monomer units of formula (1), monomer units of formula (2), and monomer units of formula (4) shown below. One of these polymers may be used alone, or two or more may be used in combination.

[0018] [ka] (1) (In formula (1), R 1represents a hydrogen atom or a methyl group, and X 1 represents a hydrogen atom, a monovalent or divalent metal atom, an ammonium group or an organic ammonium group.)

[0019]

Chemical formula

[0020]

Chemical formula

[0021]

Chemical formula

[0022] In addition, examples of the organic ammonium salt in formulas (1) to (3) include an alkylammonium group or a (hydroxy)alkylammonium group having an alkyl group or a hydroxyalkyl group with 1 to 4 carbon atoms.)

[0023] Examples of monovalent or divalent metal salts in equations (1) to (3) include sodium salts, potassium salts, calcium salts, and magnesium salts.

[0024] X in equation (2) 2 When the alkyl group is an alkyl sulfonic acid group or a salt thereof, an alkyl group having 1 to 10 carbon atoms is preferred, and an alkyl group having 1 to 8 carbon atoms is more preferred. 2 When the aryl group is an aryl sulfonic acid group or a salt thereof, an aryl group or aryl alkyl group having 6 to 10 carbon atoms is preferred.

[0025] In formula (4), alkyl groups having 1 to 10 carbon atoms are preferred, and alkyl groups having 1 to 8 carbon atoms are more preferred.

[0026] In a binary copolymer containing monomer units of formula (1) and monomer units of formula (2), the weight ratio of monomer units is, for example, 1 to 99:99 to 1.

[0027] In a ternary copolymer containing monomer units of formula (1), formula (2), and formula (4), the weight ratio of monomer units is, for example, 1-98:1-98:1-98.

[0028] The weight-average molecular weight of the above polymer is, for example, in the range of 200 to 100,000, preferably in the range of 1,000 to 30,000, and more preferably in the range of 1,500 to 20,000. If the weight-average molecular weight is less than 200, the stabilizing effect of the active ingredient may decrease, and if it exceeds 100,000, the viscosity may be high and difficult to handle.

[0029] Examples of the polymers mentioned above include polyacrylic acid (PAA), a binary copolymer of acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid (AA / AMPS), a terpolymer of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and t-butylacrylamide (AA / AMPS / t-BAM), a terpolymer of phosphonic acid, acrylic acid, and 2-acrylamide-2-methylpropanesulfonic acid (PA / AA / AMPS), maleic acid polymer (MA), and a copolymer of maleic acid and acrylic acid (MA / AA). Of these, from the viewpoint of stabilizing the active ingredient, the binary copolymer of acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid (AA / AMPS) and the terpolymer of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and t-butylacrylamide (AA / AMPS / t-BAM) are preferred.

[0030] In the water treatment agent composition, the amount of polymer blended is, for example, in the range of 0.1 to 70% by mass of solid content relative to the total amount of the composition, preferably in the range of 1 to 50% by mass, and more preferably in the range of 5 to 30% by mass. If the amount of polymer blended is less than 0.1% by mass, the scale suppression effect may not be obtained, and if it exceeds 70% by mass, the viscosity of the composition may increase, making it difficult to pump the liquid.

[0031] Examples of phosphonic acid compounds include 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) and 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP).

[0032] In the water treatment agent composition, the amount of phosphonic acid compound and polymerized phosphoric acid is, for example, in the range of 0.1 to 70% by mass of the total amount of the composition, preferably in the range of 1 to 50% by mass, and more preferably in the range of 5 to 30% by mass. If the amount of phosphonic acid compound and polymerized phosphoric acid is less than 0.1% by mass, the scale suppression effect may not be obtained, and if it exceeds 70% by mass, the precipitation of calcium scale may be promoted.

[0033] A corrosion inhibitor may be added to the water treatment agent composition. Examples of corrosion inhibitors include azole compounds such as benzotriazole and toltriazole, which are mainly used as corrosion inhibitors for copper-based metals such as copper and copper alloys, and acrylic acid polymers, zinc compounds, nitrite compounds, molybdenum compounds, and phosphoric acid compounds, which are mainly used as corrosion inhibitors for iron-based metals such as carbon steel. One of these corrosion inhibitors may be used alone, or two or more may be used in combination.

[0034] Examples of azole compounds include those that function as metal corrosion inhibitors for copper and copper alloys, such as 1,2,4-triazole, 1-methyl-1,2,4-triazole, 3-methyl-1,2,4-triazole, 3,5-dimethyl-1,2,4-triazole, 3,5-diethyl-1,2,4-triazole, 1-phenyl-1,2,4-triazole, 3-phenyl-1,2,4-triazole, 1,5-diphenyl-1,2,4-triazole, 1,3-diphenyl-1,2,4-triazole, and 3,5-diphenyl- 1,2,4-triazole, 1,2,4-triazole-3-one, 5-methyl-1,2,4-triazole-3-one, 3-methyl-1,2,4-triazole-5-one, 1-phenyl-1,2,4-triazole-3-one, 5-phenyl-1,2,4-triazole-3-one, 1-phenyl-1,2,4-triazole-5-one, urazole, 1-phenylurazole, 4-phenylurazole, benzotriazole, 1-methylbenzotriazole, 4-methylbenzotriazole, 5-methylbenzotriazole, 5,6-methylbenzo Reazol, 2-phenylbenzotriazole, 1-oxybenzotriazole, 2-(3-t-butyl-5-methyl-2-hydroxyphenyl)-5-chlorobenzotriazole, 2-(5-methyl-2-hydroxyphenyl)benzotriazole, 2-(3,5-di-t-amyl-2-hydroxyphenyl)benzotriazole, 2-(3,5-di-t-butyl-2-hydroxyphenyl)-5-chlorobenzotriazole, 2-(3,5-di-t-butyl-2-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-5-octylphenyl) Nyl)benzotriazole, 2-(2-hydroxy-4'-octoxyphenyl)benzotriazole, 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-t-butylphenyl)benzotriazole, 2-(2'-hydroxy-3-t-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-t-aminophenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-t-butyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,Examples include 5-di-t-butylphenyl)benzotriazole, 2-[2-hydroxy-3,5-bis(α,α-dimethylbenzyl)phenyl]-2H-benzotriazole, 1-naphthylbenzotriazole, 5-chlorobenzotriazole, 5-bromobenzotriazole, 5-nitrobenzotriazole, and 4,5,6,7-tetrahydrobenzotriazole. Of these, benzotriazole and toltriazoles such as 4-methylbenzotriazole and 5-methylbenzotriazole are preferred from the standpoint of distribution volume and cost.

[0035] Examples of acrylic acid-based polymers include acrylic acid and methacrylic acid.

[0036] Examples of zinc compounds include zinc sulfate, zinc chloride, zinc acetate, sodium zincate, and potassium zincate.

[0037] Examples of nitrite compounds include nitrite salts and nitrite. Examples of metal salts in this case include sodium salts, potassium salts, and ammonium salts.

[0038] Examples of molybdate compounds include orthomolybdate, paramolybdate, and metamolybdate. Examples of metal salts in this case include sodium salts, potassium salts, and ammonium salts.

[0039] Examples of phosphate compounds include phosphoric acid, orthophosphates, polyphosphates, phosphonates, and phosphorus-containing polymers. Examples of metal salts in this case include sodium salts, potassium salts, and ammonium salts.

[0040] In a water treatment agent composition, the amount of corrosion inhibitor is preferably in the range of 0.01 to 10% by mass relative to the total amount of the composition, more preferably in the range of 0.1 to 5% by mass, and more preferably in the range of 0.5 to 3% by mass. If the amount of corrosion inhibitor is less than 0.01% by mass, a corrosion inhibitory effect may not be obtained, and if it exceeds 10% by mass, precipitation may occur in the composition.

[0041] Examples of tracer substances include fluorescent substances, fluorescent polymers, sodium bromide, and lithium chloride. The inclusion of tracer substances facilitates the measurement of the concentration of water treatment agent compositions in aqueous systems. The tracer substance may be a fluorescent substance alone, or a fluorescent substance may be used in combination with one or more other tracer substances.

[0042] The fluorescent substance can be any chemical substance that absorbs a specific wavelength and emits a different wavelength (fluorescence), and there are no particular restrictions. Examples of fluorescent substances include pyrenetetrasulfonic acid and pyrenetetrasulfonate compounds such as 1,3,6,8-tetrasodium pyrenetetrasulfonate (PTSA), uranine, fluorescein, phycoerythrin, phycocyanin, rhodamine, coumarin, and naphthalene sulfonate. Alternatively, sulfonated benzonaphthofuran compounds, sulfonated dinaphthofuran compounds, sulfonated benzofluorene compounds, sulfonated dibenzofluorene compounds, sulfonated benzocarbazole compounds, and sulfonated dibenzocarbazole compounds, as described in International Patent Application Publication No. 2023 / 210363, represented by formula (5) below, may be used. From the viewpoint of solubility and stability in water treatment agents, pyrenetetrasulfonic acid and pyrenetetrasulfonate are preferred, and the use of PTSA is more preferred. One of these fluorescent substances may be used alone, or two or more may be used in combination.

[0043] [ka] (5) (In formula (5), X represents an oxygen atom, a selenium atom, a methylene group which may be substituted with an alkyl group having 1 to 8 carbon atoms, a nitrogen atom which may be substituted with an alkyl group having 1 to 8 carbon atoms, a silicon atom which may be substituted with an alkyl group having 1 to 8 carbon atoms, or a carbonyl group. n represents 0, 1, or 2. R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 Each independently represents a sulfo group or a chemically acceptable salt thereof, a hydrogen atom, a C1-C8 alkyl group, a C1-C8 alkoxy group, a C1-C8 haloalkyl group, a C6-C10 aromatic group, a halogen atom, or a hydroxyl group, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 and R 12 One to five groups selected from are sulfo groups or their chemically acceptable salts. When n is 2, multiple R 9 and R 12 They may be the same or different. However, X is an oxygen atom, n is 1, and R 1 , R 2 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 11 and R 12 When all are hydrogen atoms, R 3 and R 10 (It cannot be a sulfo group or a chemically acceptable salt thereof.)

[0044] In a water treatment agent composition, the amount of tracer substance is preferably in the range of 0.0001 to 10% by mass relative to the total amount of the composition, more preferably in the range of 0.001 to 1% by mass, and more preferably in the range of 0.01 to 0.1% by mass. If the amount of tracer substance is less than 0.0001% by mass, it may be difficult to measure the concentration of the water treatment agent composition in an aqueous system, and if it exceeds 10% by mass, the stability of the composition may decrease.

[0045] Examples of slime inhibitors (bactericides) include isothiazolinone compounds and halogenated aliphatic nitro alcohol compounds. One of these slime inhibitors may be used alone, or two or more may be used in combination.

[0046] Examples of isothiazolin compounds include 5-chloro-2-methyl-4-isothiazolin-3-one (CMI), 2-methyl-4-isothiazolin-3-one (MIT), 2-ethyl-4-isothiazolin-3-one, 2-propyl-4-isothiazolin-3-one, 2-isopropyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, 5-bromo-2-methyl-4-isothiazolin-3-one, 5-chloro-2-ethyl-4-isothiazolin-3-one, 5-bromo-2-ethyl-4-isothiazolin-3-one, 5-chloro-2-n-octyl-4-isothiazolin-3-one, 5-bromo-2-n-octyl-4-isothiazolin-3-one, and 1,2-benzoisothiazolin-3-one (BIT). Of these, 5-chloro-2-methyl-4-isothiazolin-3-one (CMI) and 2-methyl-4-isothiazolin-3-one (MIT) are preferred in terms of stability in the formulation. One of these isothiazolin compounds may be used alone, or two or more may be used in combination.

[0047] Examples of halogenated aliphatic nitro alcohol compounds include chloride aliphatic nitro alcohol compounds such as 2,2-dichloro-2-nitroethanol and 2-chloro-2-nitropropane-1,3-diol, and bromide aliphatic nitro alcohol compounds such as 2-bromo-2-nitropropane-1,3-diol (BNPK), 2,2-dibromo-2-nitroethanol (DBNE), and 2,2-dibromo-3-nitrilopropionamide (DBNPA). Of these, 2-bromo-2-nitropropane-1,3-diol (BNPK) and 2,2-dibromo-2-nitroethanol (DBNE) are preferred in terms of stability in the formulation. One of these halogenated aliphatic nitro alcohol compounds may be used alone, or two or more may be used in combination.

[0048] The water treatment agent composition contains, as a slime inhibitor, at least one of the following: isothiazolone compounds, 2,2-dibromo-2-nitroethanol, and 2-bromo-2-nitropropane-1,3-diol.

[0049] In a water treatment agent composition, the amount of slime inhibitor is, for example, in the range of 0.01 to 50% by mass relative to the total amount of the composition, preferably in the range of 0.1 to 30% by mass, and more preferably in the range of 1 to 10% by mass. If the amount of slime inhibitor is less than 0.01% by mass relative to the total amount of the composition, a slime inhibitory effect may not be obtained, and if it exceeds 50% by mass, precipitate may be generated.

[0050] The pH of the water treatment agent composition is less than 1, preferably in the range of 0.1 to 0.9, and more preferably in the range of 0.3 to 0.8. If the pH of the composition is less than 0.1, a large amount of acid may be required, and if it is 1 or higher, the stabilizing effect of the active ingredient cannot be obtained.

[0051] For adjusting the pH of the composition, it is sufficient to adjust it to a predetermined pH; there are no particular restrictions. For example, pH adjusters such as acids like hydrochloric acid, sulfuric acid, or nitric acid, or alkalis like sodium hydroxide aqueous solution or potassium hydroxide aqueous solution may be used.

[0052] The water treatment agent composition may contain other components such as oxidizing agents and surfactants, in addition to water, scale inhibitors, corrosion inhibitors, tracer substances, and slime inhibitors.

[0053] <Water Treatment Methods> The water treatment method according to this embodiment is a method of treating an aqueous system using the above-described water treatment agent composition. For example, a predetermined amount of the above-described water treatment agent composition may be added to the aqueous system.

[0054] The amount of scale inhibitor in an aqueous system should be, for example, in the range of 0.1 to 100 mg / L relative to the volume of water being treated, and preferably in the range of 1 to 50 mg / L. If the amount of scale inhibitor is less than 0.1 mg / L relative to the volume of water being treated, a scale inhibitory effect may not be obtained, and if it exceeds 100 mg / L, the amount of chemical used may become excessive.

[0055] The amount of corrosion inhibitor in an aqueous system should be, for example, in the range of 0.1 to 100 mg / L relative to the amount of water being treated, and preferably in the range of 1 to 10 mg / L. If the amount of corrosion inhibitor is less than 0.1 mg / L relative to the amount of water being treated, a corrosion inhibitory effect may not be obtained, and if it exceeds 100 mg / L, the amount of chemical used may increase.

[0056] The amount of tracer substance in the aqueous system should be, for example, in the range of 0.001 to 1.0 mg / L relative to the amount of water to be treated, and preferably in the range of 0.01 to 0.1 mg / L. If the amount of tracer substance is less than 0.001 mg / L relative to the amount of water to be treated, it may be difficult to measure the concentration of the water treatment agent composition in the aqueous system, and if it exceeds 1.0 mg / L, the amount of chemical used may increase.

[0057] The amount of slime inhibitor in an aqueous system should be, for example, in the range of 0.01 to 100 mg / L relative to the amount of water being treated, and preferably in the range of 0.1 to 10 mg / L. If the amount of slime inhibitor is less than 0.01 mg / L relative to the amount of water being treated, the slime inhibitory effect may not be obtained, and if it exceeds 100 mg / L, the amount of chemical used may increase.

[0058] The pH of the aqueous system is, for example, in the range of 6.0 to 10.0, preferably in the range of 6.5 to 9.5, and more preferably in the range of 7.0 to 9.0. If the pH of the aqueous system is below 6.0, metal corrosion may be accelerated, and if it exceeds 10.0, scale deposition may be accelerated.

[0059] For adjusting the pH of an aqueous system, it is sufficient to adjust it to a predetermined pH; there are no particular restrictions. For example, pH adjusters such as acids like hydrochloric acid, sulfuric acid, or nitric acid, or alkalis like sodium hydroxide solution or potassium hydroxide solution, can be used.

[0060] The water treatment agent composition according to this embodiment can be used for water treatment in industrial water systems such as cooling water, and for water used in the papermaking process in the pulp and paper industry. The water treatment agent composition according to this embodiment can be suitably used for water treatment in industrial water systems such as cooling water.

[0061] In the water treatment method according to this embodiment, other agents such as oxidizing agents and defoaming agents may be used in combination with the water treatment agent composition described above.

[0062] This specification includes the following embodiments. [1] A water treatment composition comprising water, a fluorescent substance, and at least one of isothiazolone compounds, 2,2-dibromo-2-nitroethanol, and 2-bromo-2-nitropropane-1,3-diol as a slime inhibitor, wherein the pH is less than 1.

[0063] The water treatment agent composition described in [2][1], Furthermore, a water treatment agent composition comprising at least one of a scale inhibitor and a corrosion inhibitor.

[0064] The water treatment agent composition described in [3][2], A water treatment agent composition comprising at least one of benzotriazole and toltriazole as the corrosion inhibitor.

[0065] A water treatment method comprising treating an aqueous system using any one of the water treatment agent compositions described in [4], [1], to [3]. [Examples]

[0066] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0067] <Examples 1 and 2, Reference Examples 1 and 2, Comparative Example 1> Examples 1 and 2, Reference Examples 1 and 2, and Comparative Example 1 were formulated by adding the formulations shown in Table 1 (mass %) to pure water. pH adjustment was performed using sulfuric acid (62.5% by mass), and formulation was carried out in a glass container at room temperature (25°C ± 1°C) while stirring with a stirrer. The polymer blending ratio was calculated as the mass ratio of solids. The stability of each water treatment agent composition was evaluated visually from its appearance after 5 days at 25°C. Compositions without precipitation or turbidity were deemed acceptable, while those with precipitation or turbidity were deemed unacceptable. The pH of the water treatment agent composition was measured using a pH measuring device (Toa DKK, IOL-30). The results are shown in Table 1.

[0068] The drugs listed in Table 1 are as follows:

[0069] (pH adjuster) sulfuric acid

[0070] (Scale inhibitor) AA polymer: Polyacrylic acid (weight-average molecular weight: 4500) AA / AMPS copolymer: A binary copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid (weight-average molecular weight: 4500) AA / AMPS / t-BAM copolymer: A terpolymer of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, and t-butylacrylamide (weight-average molecular weight: 4500) MA polymer: Maleic acid polymer (weight-average molecular weight: 1000) MA / AA copolymer: A copolymer of maleic acid and acrylic acid (weight-average molecular weight: unknown) PBTC: 2-Phosphonobutane-1,2,4-tricarboxylic acid HEDP: 1-Hydroxyethylidene-1,1-diphosphonic acid

[0071] (Corrosion inhibitor) Organic phosphoric acid: Phosphate compounds Phosphate (85% or more) Benzotriazole Triltriazole Zinc chloride

[0072] (Slime inhibitor) CMI: 5-Chloro-2-methyl-4-isothiazolin-3-one MIT:2-methyl-4-isothiazolin-3-one DBNE: 2,2-dibromo-2-nitroethanol BNPK: 2-Bromo-2-nitropropane-1,3-diol DBNPA: 2,2-dibromo-3-nitrilopropionamide BIT: 1,2-Benzisothiazoline-3-one

[0073] (Tracer substance) NaBr: Sodium bromide PTSA: 1,3,6,8-pyrenetetrasulfonic acid DTSA: Sulfonated benzonaphthofuran compounds, sulfonated dinaphthofuran compounds, sulfonated benzofluorene compounds, sulfonated dibenzofluorene compounds, sulfonated benzocarbazole compounds, sulfonated dibenzocarbazole compounds

[0074] [Table 1]

[0075] Thus, by using the composition of the examples, we were able to obtain a water treatment agent composition that contains water, a fluorescent substance acting as a tracer, and a specific slime inhibitor, and that exhibits good stability.

Claims

1. A water treatment agent composition characterized by comprising water, a fluorescent substance, and at least one of isothiazolone compounds, 2,2-dibromo-2-nitroethanol, and 2-bromo-2-nitropropane-1,3-diol as a slime inhibitor, and having a pH of less than 1.

2. A water treatment agent composition according to claim 1, A water treatment agent composition characterized by further comprising at least one of a scale inhibitor and a corrosion inhibitor.

3. A water treatment agent composition according to claim 2, A water treatment agent composition characterized by comprising at least one of benzotriazole and toltriazole as the corrosion inhibitor.

4. A water treatment method characterized by performing water treatment using the water treatment agent composition described in any one of claims 1 to 3.

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