50 results about "Dithizone" patented technology

The invention discloses a preparation method of a loofah sponge surface lead ion imprinted absorbing material and the use of the loofah sponge surface lead ion imprinted absorbing material in metal ion absorption and belongs to natural high polymer material modification. In the method, the loofah sponge natural high polymer material is used as a support, and the surface of the material is modified with a lead ion imprinted polymer. The main technical characteristics of the method include: adding acylated loofah sponge, lead-dithizone complex, 4-vinylpyridine, ethylene dimethacrylate and azodiisobutyronitrile into a chloroform medium, removing oxygen by argon in a certain proportion; introducing argon to expel oxygen; reacting in a water bath at a constant temperature of 50 to 70 DEG C, filtering and washing; and performing Soxhlet extraction by using 0.10mol / L solution of HNO3 for 12 hours, removing template lead ions, washing, drying and obtaining the material. The material has specific lead ion identification capacity, high selectivity, high absorption speed and high desorption capacity, is widely available and biodegradable, can be prepared by a simple process and has regeneration capacity and the advantages of environmental friendliness and the like.

The invention relates to a method for sequentially injecting lead in online detection of water quality, wherein each step for detecting lead in stripping voltammetry and quantitative dose delivery of required solvent or solution are finished in sequence with sequential injection method; the method comprises the following steps: plating mercury on the surface of a working electrode by using mercury plating liquid HgSO4 solution or Hg(NO3)2 solution; absorbing lead ions in a raw water sample by using polystyrene-dithizone nanofiber; then eluting and condensing into sample water for detection; respectively injecting the sample water and carrier liquid in a electrolytic bath at fixed quantities, wherein the deposition potential is -1.0 to -1.2V, the deposition time is 140-160s, the cleaning potential is -0.3V, and the time is 15s; carrying out anode stripping voltammetry detection on the sample water so as to obtain a sample water stripping voltammetry curve, wherein the stripping peak area is combined with the stripping peak area of a guide sample; and calculating to obtain the lead concentration of sample water. The invention provides a special detection device, which is accurate in fixed quantity and high in sensitivity and can realize online and quick detection of lead content in various water sources.

The invention discloses anodic oxidation treating fluid containing corrosion inhibition additive; the treating fluid is formed by adding 1.6-7.6ml of sulfuric acid, 5-30g of modifier and 10-100mg of corrosion inhibition additive in 100ml of deionized water; the modifier is adipic acid or adipate; the corrosion inhibition additive is benzotriazole, 2-mercaptobenzothiazole, dithizone or 8-oxyquinoline; the anodic oxidation treating fluid reduces the concentration of the sulfuric acid, reduces dissolving of bath solution to aerometal basal body and a generated oxidation film, and the corrosion inhibition additive is added for inhibiting excessive expansion of an oxidation film hole defect at the position of copper-bearing alloy phase particles. In the invention, the adipic acid or adipate which is environmental-protection and has low price replaces the using amount of the sulfuric acid, the film forming rate, the film layer compactness and uniformity of the anodic oxidation film are improved.

The invention discloses a preprocessing method for measuring content of noble metal ions in a high-purity reagent solution. The method comprises the following steps: processing the high-purity reagent solution utilized as a raw material by utilizing a preprocessing column loaded with polyethylene dithizone laminated resin; eluting the enriched noble metal ions by using an eluting agent, and then performing the constant volume process; and using an atomic absorption spectrograph to measure the content of the noble metal ions in the acquired high-purity reagent preprocessed solution, wherein the acquired measured result is consistent with the measured result acquired by using an X fluorescent analysis meter. Compared with the prior art, the method provided by the invention has the advantages that the operation is easy and simple, the noble metal ions in the high-purity reagent are enriched by performing the pressurization ultra-filtration, the post-processing for the acquired preprocessed solution is unnecessary, and the sample can be directly introduced for using the atomic absorption spectrograph to measure the content of noble metal ions in the high purity reagent.

The invention discloses an ultra-trace lead-cadmium ion detection method and a detection test strip. The detection method comprises the following steps: (1) acidifying a sample; (2) removing Hg2+ and Zn2+ in the sample; (3) diluting the sample by utilizing a buffer solution to obtain a neutral sample; (4) enabling the neutral sample obtained in the step (3) to be contacted with dithizone to generate a lead-cadmium ion-dithizone complex; (5) adding sulfide solution so as to enable the lead-cadmium ion-dithizone complex to be completely reacted to generate PbS and / or CdS; (6) carrying out silver staining reaction on the mixture containing PbS and / or CdS obtained in the step (5), and determining the concentration of lead and cadmium ions in the to-be-detected sample according to the grey scale of a reaction product. The test strip comprises a substrate film and a dithizone layer, wherein the dithizone layer is compounded onto the substrate film, and the test strip is packaged in a vacuum manner. The detection method and the detection test strip are sensitive inn detection, simple in judgment, capable of reaching the standard of naked eye detection, strong in applicability and stable inn performance.

The present invention provides a method of recovering a heavy metal by which the variation in heavy metal recovery rate among samples can be suppressed. A mixture of a sample and a chelating agent capable of chelating with a heavy metal is prepared. A complex between a heavy metal being in the sample and the chelating agent is formed in the presence of a masking agent for a thiol group in the mixture. The heavy metal in the sample is recovered by recovering the complex. By this method, a heavy metal can be recovered with suppressing the variation in the recovery rate among samples. The chelating agent preferably is 1,5-diphenyl-3-thiocarbazone (dithizone). As the masking agent, N-ethylmaleimide, iodoacetamide, iodoacetic acid, or the like can be used.

The present invention provides a method of recovering a heavy metal by which the variation in heavy metal recovery rate among samples can be suppressed. A mixture of a sample and a chelating agent capable of chelating with a heavy metal is prepared. A complex between a heavy metal being in the sample and the chelating agent is formed in the presence of a masking agent for a thiol group in the mixture. The heavy metal in the sample is recovered by recovering the complex. By this method, a heavy metal can be recovered with suppressing the variation in the recovery rate among samples. The chelating agent preferably is 1,5-diphenyl-3-thiocarbazone (dithizone). As the masking agent, N-ethylmaleimide, iodoacetamide, iodoacetic acid, or the like can be used.

The invention relates to a rapid testing method of a zinc salt in milk, which comprises the following steps that: 2ml of a standard milk sample and 2ml of a milk sample to be tested are respectively added into 1ml of dithizone-carbon tetrachloride solution with the concentration of 0.1g / L; the standard milk sample is mixed with the dithizone-carbon tetrachloride solution uniformly to prepare a mixture A, and the color liquid surface dots of the mixture A and the color of lower layered liquid serve as standard color disks; the milk sample to be tested is mixed with the dithizone-carbon tetrachloride solution uniformly to prepare a mixture B, the color of liquid surface dots of the mixture B and the color of the lower layered liquid are observed; the color of the liquid surface dots of the mixture B and the color of the lower layered liquid are visually compared with the color of the standard color disks, if the color of the liquid surface dots is the same with the color of the lower layered liquid, the zinc content of the milk sample to be tested is above 50mg / kg, and if the color of the liquid surface dots is different from the color of the lower layered liquid, the zinc content of the milk sample to be tested is below 50mg / kg. The method has the advantages of low cost, convenient and rapid operation and short testing time, and is a rapid qualitative testing method.