A colorimetric method for simultaneous determination of hexavalent chromium and lead

A technology for colorimetric determination and hexavalent chromium, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, and can solve the problem that hexavalent chromium and lead cannot be quickly measured on site, etc. problems, to achieve the effects of simplifying the determination method and operation steps, saving reagents, and being easy to popularize and apply

Inactive Publication Date: 2011-12-21
CHONGQING UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a simultaneous colorimetric determination ...

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  • A colorimetric method for simultaneous determination of hexavalent chromium and lead
  • A colorimetric method for simultaneous determination of hexavalent chromium and lead
  • A colorimetric method for simultaneous determination of hexavalent chromium and lead

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Embodiment 1

[0021] In this embodiment, the composite color development system selects 0.05mol / L diphenylcarbazide and dithizone with a concentration of 0.025mmol / L and 0.124mol / L sulfamic acid. figure 1 In the technical route shown, R is the composite chromogenic system, S is the water sample, open the No. 2 valve, the peristaltic pump draws the water sample, then open the No. 1 valve, extract the composite chromogenic system, perform spectral detection, and discharge the waste liquid in the waste water. Liquid pool W, see attached for scanning spectrogram figure 2 , with 0~0.5mg / L potassium dichromate and 0~0.1mg / L lead nitrate as the standard solution, establish a standard curve, and measure the hexavalent chromium and lead ion values ​​of the sample.

[0022] The present invention carries out double-wavelength processing to the data of standard solution spectral measurement, establishes standard curve, and the slope of the standard equation of chromium ion and lead ion is respectively...

Embodiment 2

[0032] In the present embodiment, the composite color developing system selects Alizarin Blue S of 0.01mol / L and dithizone with a concentration of 0.025mmol / L, and also has a concentration of 0.124mol / L sulfamic acid, and the water sample is developed according to the above steps. Color detection, with 0.001~0.5mg / L potassium dichromate and 0~0.1mg / L lead nitrate as the standard solution, establish a standard curve, and determine the chromium ion and lead ion value of the sample.

[0033] The present invention carries out dual-wavelength processing to the data of standard solution spectral measurement, establishes standard curve, the slope of the standard equation of hexavalent chromium ion and lead ion is respectively 0.9917, 0.3221, and blank solution measures 5 times to obtain the detection of this method. The limits were 0.008 mg / L and 0.010 mg / L respectively (detection limit = (3×standard deviation of blank) / slope of standard curve).

[0034] In summary, the minimum detec...

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Abstract

The invention claims a simultaneous colorimetric determination method for joint determination of hexavalent chromium and lead in water, which is characterized in that it uses mixed reagents to form different colored complexes with hexavalent chromium and lead ions in water samples, and compares Colorimetric measurement of the output of two colored complexes to achieve simultaneous determination of hexavalent chromium and lead. The invention can solve the problems that the existing detection methods for hexavalent chromium and lead ions are cumbersome to operate and cannot realize rapid and on-site determination of two indexes at the same time.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, and relates to a simultaneous colorimetric determination method for rapid analysis of hexavalent chromium and lead. Background technique [0002] Hexavalent chromium and lead are very dangerous heavy metal pollutants, and their biological toxicity is very significant, causing great harm to human health and the environment. The whole world spends a lot of manpower, material resources and financial resources on the detection of heavy metals every year. It is of great significance to develop fast, simple, low-cost and high-sensitivity detection methods for heavy metal ions. [0003] At present, real-time online and rapid detection of chromium ions and lead ions is the focus and difficulty of environmental monitoring. The existing determination methods of hexavalent chromium and lead are diphenylcarbazide spectrophotometry (see national standard GB 7467-87) and dithizone spectropho...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 莫志宏范艳平温志渝向小娥
Owner CHONGQING UNIV
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