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Molybdate radical ion and nitrite radical ion concentration test card and its preparing method

A technology of nitrite ion and molybdate ion, applied in chemical method analysis, measuring device, instrument and other directions, can solve the problems of difficult realization, high cost, large amount of reagents, etc., and achieves simple process, simple operation and good repeatability. Effect

Inactive Publication Date: 2005-08-03
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

As a kind of molybdenum-thiocyanate-rhodamine B-polyvinyl alcohol system is used to measure molybdenum content (Teng Yumin, Xu Shengjie. Research on ultra-high sensitive color reaction and its application [J]. Analytical Chemistry, 1991, 19( 5): 514-518) method, the color temperature must be controlled at 7 ~ 13 ℃, which brings inconvenience to practical application; if molybdenum-thiourea-copper-thiocyanate-rhodamine B-polyvinyl alcohol is used Determination of trace amounts of molybdenum by sensitive colorimetric system (Yang Bingyi, Chen Zhicheng, Zhou Yonghong, etc. Determination of trace amounts of molybdenum and its mechanism by high-sensitivity colorimetric reaction [J]. Spectrum Experiment, 2000, 17(3): 322-325) Although the above-mentioned method has been improved, it can develop color normally at 10-25°C, but there are as many as seven kinds of reagents used, and the reaction can only be realized in a solution, and it cannot be made into a test strip that is easy to operate; Such as utilizing butyl rhodamine B to replace rhodamine B to measure molybdenum content (Zhang Dong, Gong Piguo, Wang Yanjun. High-sensitivity color development system measures trace molybdenum [J]. Shenyang Institute of Technology Journal, 2003, 22 (2): 57-60), the molar absorptivity is greatly improved, but there are also the problems of high reagent consumption, high cost, and difficult realization on test strips; the preparation method (US 5106581) of molybdate ion concentration test strips, Same as above-mentioned literature, can only measure the concentration of a kind of ion; As a kind of test box of on-line detection nitrite (Lou Ming. Research on test box of on-line detection technology of nitrite in food [J]. Meat Industry, 2003, 265 (5): 30-34), after utilizing nitrite and p-aminobenzenesulfonic acid diazotization reaction, then generate azo dyes with naphthalene ethylenediamine hydrochloride coupling reaction, but because this method only It is limited to detect whether the nitrite content in food meets the international standard, so the concentration range of its measurement is relatively narrow; and a kind of preparation method (CN03130015.4) of nitrite detection test paper can only measure a kind of nitrite ion, and There are two steps of impregnation and drying in the production of test paper, and the process is relatively cumbersome

Method used

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  • Molybdate radical ion and nitrite radical ion concentration test card and its preparing method

Examples

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Embodiment 1

[0018] A test card for detecting the content of molybdate ions and nitrite ions in cooling liquid and a preparation method thereof. The test card includes test paper and a standard color comparison card. The preparation method of the test paper is:

[0019] The preparation method of the chromogenic paper sheet [1] indicating the molybdate ion is: soak the ordinary quantitative filter paper in the mixture of 53g / L gallic acid methanol solution and 225g / L hydroxylamine sulfate solution for 15min, take it out and place it in the drying box, Control the temperature at 25-30°C, dry for 12 hours, and cut into small rectangular pieces of 5×10mm;

[0020] The preparation method of the chromogenic paper sheet [2] indicating nitrite ion is: soak ordinary quantitative filter paper in 16g / L p-aminobenzenesulfonic acid, 8g / L dihydrochloride-1-naphthaleneethylenediamine and 50g / L Put in the mixture of L tartaric acid for 15 minutes, take it out and put it in a drying oven, control the temp...

Embodiment 2

[0025] A test card for detecting the content of molybdate ions and nitrite ions in cooling liquid and a preparation method thereof. The test card includes test paper and a standard color comparison card. The preparation method of the test paper is:

[0026] The preparation method of the chromogenic paper sheet [1] indicating the molybdate ion is: soak the ordinary quantitative filter paper in the mixed solution of 22g / L gallic acid ethanol solution and 50g / L hydroxylamine sulfate solution for 15min, take it out and place it in the drying box, Control the temperature at 60-65°C, dry for 12 hours, and cut into small rectangular pieces of 5×10mm;

[0027] The preparation method of the chromogenic paper sheet [2] indicating nitrite ion is: soak ordinary quantitative filter paper in 30g / L p-aminobenzenesulfonic acid, 25g / L dihydrochloride-1-naphthaleneethylenediamine and 120g / L Put in the mixture of L tartaric acid for 15 minutes, take it out and put it in a drying oven, control t...

Embodiment 3

[0030] A test card for detecting the content of molybdate ions and nitrite ions in cooling liquid and a preparation method thereof. The test card includes test paper and a standard color comparison card. The preparation method of the test paper is:

[0031] The preparation method of the chromogenic paper sheet [1] indicating molybdate ion is: soak ordinary quantitative filter paper in the mixture of n-propanol solution of 39g / L gallic acid and 75g / L hydroxylamine sulfate solution for 15min, take it out and put it in the drying box Inside, the temperature is controlled at 35-40°C, dried for 12 hours, and cut into small rectangular pieces of 5×10mm;

[0032] The preparation method of the chromogenic paper sheet [2] indicating nitrite ion is: soak ordinary qualitative filter paper in 20g / L p-aminobenzenesulfonic acid, 15g / L dihydrochloride-1-naphthalene ethylenediamine and 100g / L tartaric acid in the mixed solution for 15 minutes, then take it out and place it in a drying oven, ...

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Abstract

The present invention relates to a kind of molybdate radical ion and nitrite radical ion concentration test card and its preparation process. The test card includes test paper and standard color check card, and the test paper has molybdate radical ion indicating color developing paper sheet and nitrite radical ion indicating color developing paper sheet fixed on the base sheet. The molybdate radical ion indicating color developing paper sheet is prepared through soaking filter paper in mixed solution of gallic acid and hydroxylamine sulfate, drying and photophobic keeping; and the nitrite radical ion indicating color developing paper sheet is prepared through soaking filter paper in mixed solution ofaminobenzene sulfonic acid, dihydrochloride-1-naphthyl ethylene diamine and tartaric acid, drying and photophobic keeping. The present invention may be used in testing the concentration of molybdate radical ion and nitrite radical ion simultaneously.

Description

1. Technical field [0001] The invention relates to an anion concentration test card and a preparation method thereof, in particular to a molybdate ion and nitrite ion concentration test card and a preparation method thereof. 2. Background technology [0002] Motor vehicle engine cooling systems contain a variety of metals and alloys such as copper, solder, brass, iron, cast iron, aluminum and magnesium. These metals are susceptible to corrosion in corrosive liquids and high temperature and high pressure environments, which will affect the normal operation of the engine combustion chamber and cause the engine to overheat and fail. The engine failure rate caused by the engine cooling system of heavy-duty mining vehicles is as high as 40% every year. Therefore, it is particularly important to maintain the cooling system in time to maintain the normal freezing point of the coolant and ensure the appropriate level of anti-corrosion agents. Anti-corrosion agents are usually added...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N31/00
Inventor 伍林曹淑超易德莲秦晓蓉欧阳兆辉王艳连兰
Owner WUHAN UNIV OF SCI & TECH
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