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Testing method for lead content in water body

A test method and water body technology, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as perishable, inaccurate test results, and test instability

Active Publication Date: 2014-01-01
深圳市和峰汇测检测技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the domestic lead water quality online monitors use the electrode method, which has a narrow measurement range, and the electrodes are expensive, easy to damage, and high maintenance costs; the lead equipment of the colorimetric method also uses dithizone spectrophotometry. (GB7470-87), the method is to use lead in a slightly alkaline solution to react with dithizone to form a red complex, and use chloroform to extract the colorimetric
The highly toxic reagent potassium cyanide and organic reagents are used for extraction, the operation is very complicated and the pollution is great, and the dithizone is very unstable and easy to deteriorate, the test results are inaccurate, and it will also seriously affect the stability of the analyzer. test instability

Method used

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  • Testing method for lead content in water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Take 50mL of various water samples in a 250mL volumetric flask, control the lead concentration of the water samples at 0.02-2mg / L, adjust the pH value of the water samples to 9, add 60mL of masking agent and 30.0mL of developer solution in sequence mL, shake well and let it stand for 15 minutes, then add 10.0 mL of chloroform for extraction. Remove the supernatant liquid and measure the absorbance in the 476nm wavelength range with a UV752 ultraviolet-visible spectrophotometer, and read the lead concentration through the prefabricated standard curve.

[0053] Wherein, the color developer includes TPPS4, and also includes solvents: sodium hydroxide and water, the concentration of TPPS4 is 0.08g / L, and the mass of sodium hydroxide is 60g. Described masking agent is to comprise the triammonium citrate of the ethylenediamine of 36mL and 24mL, and the volume concentration of described ethylenediamine is 20%, the mass concentration of described triammonium citrate is 280g / L, ...

Embodiment 2

[0055] Take 30mL of various water samples in a 250mL volumetric flask, control the lead content concentration of the water samples at 0.02-2mg / L, adjust the pH value of the water samples to 10, add 50mL of masking agent and 15.0mL of developer solution in sequence mL, shake well and let stand for 20min, then add 5.0mL of tetrachloromethane for extraction. Remove the supernatant liquid and measure the absorbance in the 480nm wavelength range with a UV752 ultraviolet-visible spectrophotometer, and read the lead concentration through the prefabricated standard curve.

[0056] Wherein, the developer includes TPPS4, and also includes solvents: sodium hydroxide and water, the concentration of TPPS4 is 0.1 g / L, and the mass of sodium hydroxide is 65 g. Described masking agent is to comprise the triammonium citrate of the ethylenediamine of 15mL and 15mL, and the volume concentration of described ethylenediamine is 24%, and the mass concentration of described triammonium citrate is 27...

Embodiment 3

[0058] Take 30mL of various water samples in a 250mL volumetric flask, control the lead concentration of the water samples at 0.02-2mg / L, adjust the pH value of the water samples to 11, add 40mL of masking agent and 26.0mL of developer solution in sequence mL, shake well and let it stand for 18 minutes, then add 5.0 mL of tetrachloromethane for extraction. Take out the supernatant and measure the absorbance in the 460nm wavelength range with a UV752 ultraviolet-visible spectrophotometer, and read the lead concentration through the prefabricated standard curve.

[0059] Wherein, the color developer includes TPPS4, and also includes solvents: sodium hydroxide and water, the concentration of TPPS4 is 0.09g / L, and the mass of sodium hydroxide is 63g. Described masking agent is to comprise the triammonium citrate of the ethylenediamine of 25mL and 15mL, and the volume concentration of described ethylenediamine is 18%, and the mass concentration of described triammonium citrate is 3...

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Abstract

The invention discloses a testing method for lead content in a water body. The testing method includes the following steps: obtaining a water body to be tested, adjusting the pH value of the water body to be tested to 9-13; adding a masking agent and a color developing agent in the water body to be tested, mixing and standing; testing the lead content of an extract obtained through extraction and adopting a spectrophotometric method, wherein the testing wave length is 460-480 nm, the masking agent includes ethylenediamine and triammonium citrate; the color developing agent includes TPPS4 with the concentration of 0.08-0.1 g / L. The testing method is accurate and stable, and can be excellently applied in real-time on-line monitoring equipment for accurate and effective testing of the heavy metal ion lead.

Description

technical field [0001] The invention relates to heavy metal monitoring technology, in particular to a method for testing lead content in water. Background technique [0002] Lead is a heavy metal element that seriously endangers human health. It can affect various organs such as nerves, hematopoiesis, digestion, urology, reproduction and development, cardiovascular, endocrine, immunity, bones, etc., mainly the nervous system and hematopoietic system. The governance damage caused by lead to children is irreversible. With the development of the economy, the environmental pollution is becoming more and more serious, so it is imperative to develop an accurate and reliable online monitor for lead water quality. [0003] At present, most of the domestic lead water quality online monitors use the electrode method, which has a narrow measurement range, and the electrodes are expensive, easy to damage, and high maintenance costs; the lead equipment of the colorimetric method also us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 余晔黄俊谭伟田应林谢怀军
Owner 深圳市和峰汇测检测技术有限公司
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