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Water-quality hexavalent-chromium mixed color developing agent and preparation method thereof

A preparation method, hexavalent chromium technology, applied in the direction of material analysis, measuring devices, instruments, etc. by observing the impact on chemical indicators, can solve the problems of toxicity, poisoning, and environmental pollution, and achieve high measurement accuracy, The effect of eliminating the influence and simplifying the measurement operation steps

Inactive Publication Date: 2017-05-31
云南天朗环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that acetone is a toxic and highly volatile organic reagent, which is harmful to the human body and pollutes the environment.

Method used

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  • Water-quality hexavalent-chromium mixed color developing agent and preparation method thereof
  • Water-quality hexavalent-chromium mixed color developing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Dissolve 8mL of concentrated phosphoric acid in an appropriate amount of water, then add 0.2g of diphenylcarbazide and 70mL of ethanol, shake well to dissolve, and then add the remaining water, so that each 100mL of water-quality hexavalent chromium mixed developer contains the following Components: 0.2g of diphenylcarbazide, 70mL of ethanol, 8mL of concentrated phosphoric acid, and 22mL of water to obtain a mixed color developer of hexavalent chromium in water. Wherein, ethanol is absolute ethanol, the mass concentration of concentrated phosphoric acid is 85%, and water is distilled water.

[0016] Drawing of standard working curve:

[0017] Add 0, 0.20, 0.50, 1.00, 2.00, 4.00, 6.00, 8.00 and 10.00mL of 1µg / mL chromium standard solution to nine 50mL colorimetric tubes, dilute with water to the mark line, and add 2mL of the above-mentioned mixed developer , shake well, after standing for 10min, measure at 540nm wavelength, such as figure 1 shown.

[0018] From figur...

Embodiment 2

[0025] Dissolve 6mL of concentrated phosphoric acid in an appropriate amount of water, then add 0.2g of diphenylcarbazide and 70mL of ethanol, shake well to dissolve, and then add the remaining water, so that each 100mL of water-quality hexavalent chromium mixed developer contains the following Components: 0.2g of diphenylcarbazide, 70mL of ethanol, 6mL of concentrated phosphoric acid, and 24mL of water to obtain a mixed color developer of hexavalent chromium in water. Wherein, ethanol is absolute ethanol, the mass concentration of concentrated phosphoric acid is 85%, and water is distilled water.

Embodiment 3

[0028] For a certain clean surface water, two methods are used for determination. The determination steps and results are as follows:

[0029] The method of the present invention: take 50mL water sample and place it in a 50mL colorimetric tube, add 2mL of the water quality hexavalent chromium mixed color developer obtained in Example 2, shake well, after 5min, measure with a 30mm colorimetric cell at a wavelength of 540nm , by calculation, the hexavalent chromium content of the water sample is 0.885mg / L.

[0030] "GB7467-87" diphenylcarbazide spectrophotometry: take 50mL water sample into 50mL colorimetric tube, add 0.5mL (1+1) H 3 PO 4 solution and 0.5mL (1+1) H 2 SO 4 Solution, shake well, add 2mL color developer (I), shake well, after 5min, at 540nm wavelength, measure with 30mm cuvette, by calculation, the hexavalent chromium content of the water sample is 0.895mg / L.

[0031] By comparing the measurement results of the two methods, there is no obvious difference in ...

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Abstract

The invention discloses a water-quality hexavalent-chromium mixed color developing agent and a preparation method thereof. The mixed color developing agent per 100mL comprises, by weight, 0.2g of diphenylcarbazide, 70mL of ethyl alcohol, 6-12mL strong phosphoric acid and 18-24mL of water. According to the color developing agent, the ethyl alcohol replaces acetone, serves as solvents and is environmentally friendly and harmless to human body, and the environments cannot be polluted. When the color developing agent is used, 2mL of mixed color developing agents are directly added, so that hexavalent chromium can be measured, the strong phosphoric acid is added into the mixed color developing agent, acidity is controlled, and the influence of ferric iron in a water sample on measurement of hexavalent-chromium content can be removed. The mixed color developing agent simplifies measuring steps and is high in measuring accuracy.

Description

technical field [0001] The invention relates to a water quality hexavalent chromium mixed color developer and a preparation method thereof, belonging to the technical field of water quality hexavalent chromium detection. Background technique [0002] The common valence states of chromium compounds are trivalent and hexavalent. Hexavalent chromium is very harmful to human health. To fish, trivalent chromium compounds are more toxic than hexavalent chromium. In water, hexavalent chromium is generally expressed as CrO 4 2- 、Cr 2 o 7 2- 、HCrO 4 - There are three anion forms, and the compounds of trivalent chromium and hexavalent chromium can be converted to each other under the influence of pH value, organic matter, redox substances, temperature and hardness in water. [0003] At present, the determination method of hexavalent chromium in water is diphenylcarbazide spectrophotometry, and the preparation of its color developer is to dissolve diphenylcarbazide in acetone, ...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78G01N2021/775
Inventor 张燕玲张海涛史花丽杨雪景曹海燕
Owner 云南天朗环境科技有限公司
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