On-site emergency detection reagent for chromium in water and use method thereof
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An emergency detection and reagent technology, applied in the field of analysis and detection, to achieve the effects of good stability, simple operation and high sensitivity
Active Publication Date: 2016-08-03
HARBIN INST OF TECH
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[0004] However, the above studies are applicable to laboratory analysis
So far, there has been no report about subpackaging DPC, ceric sulfa
Method used
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Embodiment 1
[0032] Preparation of chromium (VI) detection reagent: weigh 1g of diphenylcarbazide and 20g of sodium chloride, mix and grind evenly to obtain a solid developer; measure 50mL of 85% phosphoric acid and mix with 50mL of deionized water to obtain 1+1 phosphoric acid; Weigh 0.2 g of solid color developer, add 0.1 mL of 1+1 phosphoric acid, 0.5 mL of ethyl acetate, and mix with deionized water to 1 mL to obtain color developer I.
Embodiment 2
[0034] Preparation of total chromium detection reagent: Weigh 0.2g solid color developer, add 0.5mL ethyl acetate, mix with deionized water to 1mL to obtain color developer II; weigh 0.404g ceric sulfate, dissolve in 50mL deionized water , add 10mL of 1+1 phosphoric acid and heat to dissolve, after cooling, take 0.1mL of the solution and deionized water to make 1mL of reagent to obtain oxidant A; weigh 0.2g of sodium azide, dissolve in 100mL of deionized water to obtain reducing agent B.
[0035] The above-mentioned diphenylcarbazide, sodium chloride, ethyl acetate, ceric sulfate, and sodium azide are commercially available analytically pure chemicals.
Embodiment 3
[0037] The chromium (VI) detection reagent obtained in Example 1 of the present invention was used to determine the concentration of chromium (VI) in simulated low-pollution water samples of the Songhua River.
[0038] After the Songhua River water sample was filtered through filter paper, 5 mL was taken in a glass test tube, and 0.1 mL of 10 mg / L chromium (Ⅵ) standard solution was added to the test tube to simulate a low-concentration polluted water sample. Add chromogenic agent Ⅰ (1mL) and add water to 10mL, shake evenly, let stand for 10min, measure the absorbance at a wavelength of 540nm with a spectrophotometer, and calculate the concentration by substituting it into the chromium (Ⅵ) standard curve. The results of the six measurements are respectively : 0.117, 0.117, 0.119, 0.117, 0.118, 0.116mg / L, the relative standard deviation was 0.88%, and the recovery rate was 97.67%. The result determined by the national standard method is 0.120mg / L, and the value difference is sma...
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Abstract
The invention discloses an on-site emergency detection reagent for chromium in water and a use method thereof. Chromium (VI) and diphenylcarbazide (DPC) have chromogenic reaction under acidic conditions to prepare a color developing agent, ceric sulfate and chromium oxide (III) have oxidation reaction under acidic conditions to prepare oxidant, and sodium azide is selected as a reduction agent. The use method includes the following steps that firstly, when the concentration of chromium (VI) in a water sample is measured, a color developing agent I is added into a 5 mL to-be-detected water sample and dissolved till the volume is 10 mL, the mixture stands still for 10 min and is measured by a portable spectrophotometer, and the concentration of chromium (VI) in the to-be-detected water sample is obtained; secondly, when the total chromium concentration in the water sample is measured, the oxidant A is added into a 5 mL to-be-detected water sample, the water sample is light yellow, the mixture stands still for 10-15 min, then 1-2 drops of reduction agent B is added till light yellow fades, a color developing agent II is added till the volume is 10 mL, the mixture stands still for 10 min and is measured by the spectrophotometer, and the total chromium concentration in the to-be-detected water sample is obtained. The reagent has the advantages of being high in sensitivity, good in accuracy, high in timeliness, convenient to carry and the like.
Description
technical field [0001] The invention belongs to the technical field of analysis and detection, and relates to an on-site emergency detection reagent for chromium in a water body and a use method thereof. Background technique [0002] Sudden water pollution incidents refer to the pollution leakage caused by human factors or natural phenomena, resulting in the water body containing a large amount of pollutants in a short period of time and causing water quality deterioration. This phenomenon not only destroys the normal function of the water body, but also seriously affects the social economy. develop. Common pollutants include acids, alkalis, organic matter, heavy metals, algae, oils, biologicals, etc. Among them, heavy metal pollutants have the characteristics of high toxicity, extensive pollution sources, easy to be enriched by organisms, and biomagnification effects, which can easily cause irreversible harm to the environment. Heavy metal chromium is mainly used in metal...
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