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Method for detecting total chromium in water

A technology for detecting water and water samples, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of not conforming to the concept of green environmental protection, consuming energy, requiring heating, etc.

Inactive Publication Date: 2014-05-28
WUXI DIANCHUANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only has a long detection cycle, but also requires heating, which consumes energy and does not conform to the concept of green environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take 12ml of 5 kinds of chromium standard solutions with concentrations of 0mg / L, 0.05mg / L, 0.1mg / L, 0.5mg / L and 1mg / L respectively in 5 colorimetric tubes, add 1ml of 1% dilute sulfuric acid , PH=1.5;

[0016] (2) Add 1ml of 0.3% diphenylcarbazide alcohol solution and mix well;

[0017] (3) Add 1ml of 2% hydrogen peroxide solution respectively;

[0018] (4) Add 1ml of 3% sodium hydroxide solution, pH = 12.5, stir evenly, and let stand for 1min;

[0019] (5) Add 1ml of 44% sulfuric acid, PH=0.5, mix well, let stand for 1min;

[0020] (6) Transfer the obtained solutions to cuvettes respectively, and measure the absorbance one by one under a 540nm light source;

[0021] (7) According to the measured ABS values ​​of the five standard solutions, the standard working curve is: Y=0.2082X+0.0023, r=0.9997;

[0022] (8) Take a water sample and repeat the above 1-6 process. The measured ABS value of the water sample is 0.034, which is substituted into the standard workin...

Embodiment 2

[0024] (1) Take 14ml of 5 kinds of chromium standard solutions with concentrations of 0mg / L, 0.05mg / L, 0.1mg / L, 0.5mg / L and 1mg / L respectively in 5 colorimetric tubes, add 0.03% dilute sulfuric acid 3ml ,PH=3;

[0025] (2) Add 3ml of 0.5% diphenylcarbazide alcohol solution and mix well;

[0026] (3) Add 3ml of 1.5% hydrogen peroxide solution respectively;

[0027] (4) Add 3ml of 3.5% sodium hydroxide solution, pH = 13, stir well, and let stand for 1min;

[0028] (5) Add 3ml of 4.8% sulfuric acid, PH=2, mix well, let stand for 1min;

[0029] (6) Transfer the obtained solutions to cuvettes respectively, and measure the absorbance one by one under a 540nm light source;

[0030] (7) According to the measured ABS values ​​of the five standard solutions, the standard working curve is: Y=0.2076X+0.0029, r=0.9994;

[0031] (8) Take a water sample and repeat the above 1-6 process. The measured ABS value of the water sample is 0.057, which is substituted into the standard working cu...

Embodiment 3

[0033] (1) Take 6ml of 5 kinds of chromium standard solutions with concentrations of 0mg / L, 0.05mg / L, 0.1mg / L, 0.5mg / L and 1mg / L respectively in 5 colorimetric tubes, add 2ml of 2% dilute sulfuric acid ,PH=1;

[0034] (2) Add 2ml of 1% diphenylcarbazide alcohol solution and mix well;

[0035] (3) Add 2ml of 3% hydrogen peroxide solution respectively;

[0036] (4) Add 2ml of 1.7% sodium hydroxide solution, pH = 11, stir well, and let stand for 1min;

[0037] (5) Add 2ml of 28% sulfuric acid respectively, PH=0.1, mix well, let stand for 1min;

[0038] (6) Transfer the obtained solutions to cuvettes respectively, and measure the absorbance one by one under a 540nm light source;

[0039] (7) According to the measured ABS values ​​of the five standard solutions, the standard working curve is: Y=0.2116X+0.0022, r=0.9996;

[0040] (8) Take a water sample and repeat the above 1-6 process. The measured ABS value of the water sample is 0.112, which is substituted into the standard ...

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Abstract

The invention discloses a method for detecting total chromium in water. The method comprises the following steps: putting five chromium standard solutions that the volumes are the same and the concentrations are respectively 0 mg / L, 0.05 mg / L, 0.1 mg / L, 0.5 mg / L and 1 mg / L into five reactors, adding 0.03-5% of dilute sulfuric acid, and adjusting the pH values to be 1-3; respectively adding 1-3ml of 0.3-3% diphenylcarbazide alcoholic solution, and uniformly stirring; respectively adding 1-3ml of 1.5-5% hydrogen peroxide solution, respectively adding 0.5-4.2% sodium hydroxide solutions, adjusting the pH values to be 11-13, uniformly stirring, and standing for 1 minute; respectively adding 4.8-44% of sulfuric acid, adjusting the pH value to be 0.1-2, uniformly stirring, and standing for 1 minute; respectively transferring the obtained solutions into cuvettes, and measuring the absorbancy under a light source of 540nm one by one; making a standard working curve according to the measured ABS values of the five standard solutions; taking one water sample, repeating the steps 1-6, and substituting a measured ABS value of the water sample into the standard working curve to calculate the concentration of the total chromium in the water sample. The method can save time and labor, and can simply and accurately detect total chromium in water.

Description

technical field [0001] The invention relates to a method for detecting total chromium in water, and is especially suitable for the field of online monitoring of water quality. Background technique [0002] Chromium is a highly toxic heavy metal that easily enters human cells, causing damage to liver, kidney and other internal organs and DNA. Accumulation in the human body is carcinogenic and may induce gene mutations. At present, the methods for detecting chromium mainly include flame atomic absorption spectrophotometry, graphite furnace atomic absorption spectrometry, etc. Although these methods are simple and fast, they are limited to laboratory detection and have not been successfully applied to the field of online water quality monitoring. In the field of online water quality monitoring, the method of detecting total chromium by colorimetry is mainly to use ammonium persulfate as an oxidant to oxidize trivalent chromium to hexavalent chromium, then add a color developer,...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 徐兴黄斌钱佳伟
Owner WUXI DIANCHUANG TECH
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