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Novel detection method for total chromium content in environmental water sample capable of resisting interference of multiple metal ions

A detection method and technology for metal ions, which are applied in the field of analytical chemistry to achieve the effects of good reproducibility, increased color development speed and efficiency, and satisfactory standard addition recovery rate

Inactive Publication Date: 2018-03-27
ANHUI WAYEE SCI & TECH CO LTD
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Problems solved by technology

[0004] The present invention provides a new detection method for the total chromium content in environmental water samples that is resistant to the interference of various metal ions. Good performance

Method used

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  • Novel detection method for total chromium content in environmental water sample capable of resisting interference of multiple metal ions
  • Novel detection method for total chromium content in environmental water sample capable of resisting interference of multiple metal ions
  • Novel detection method for total chromium content in environmental water sample capable of resisting interference of multiple metal ions

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Embodiment Construction

[0040] The present invention can be explained in more detail by the following examples:

[0041] 1. Preparation of standard solution, environmental water sample and standard solution for environmental water sample:

[0042] (1) Preparation of hexavalent chromium standard solution:

[0043] Accurately pipette 0.2ml, 0.5ml, 1.0ml, 2.0ml, 5.0ml of hexavalent chromium standard stock solution with a concentration of 100mg / L into 1000ml volumetric flask, dilute to the mark with ultrapure water, shake up and down , that is, hexavalent chromium standard solutions with concentrations of 0.02mg / L, 0.05mg / L, 0.1mg / L, 0.2mg / L, and 0.5mg / L were obtained respectively.

[0044] (2) Preparation of environmental water samples to be tested:

[0045] The retrieved water samples containing suspended matter were allowed to stand overnight, and the supernatant was taken for measurement.

[0046] (3) Preparation of the standard addition solution for the environmental water sample to be tested:

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Abstract

The invention discloses a novel detection method for total chromium content in an environmental water sample capable of resisting interferences of multiple metal ions. The method has the beneficial effects that a reagent formula is simple, the addition amount of each reagent can be properly regulated according to actual use conditions, the method is simple, the linearity and the repeatability arerelatively good, the adding standard recovery rate can meet the requirements, and the influences caused by other one or multiple mixed meal ions are relatively small. The method is applied to the water quality online monitoring field, has extremely high practical values, is simple and strong in operability, is capable of resisting the interferences of multiple types of metal ions and can meet therequirements of water quality online monitoring industries.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a novel detection method for total chromium content in environmental water samples which is resistant to the interference of various metal ions. Background technique [0002] The principle of the total chromium detection method is: in an acidic solution medium, under a certain temperature and pressure, chromium in different valence states and forms in the environmental water sample is oxidized to hexavalent chromium by persulfate or potassium permanganate, and hexavalent chromium Chromium ions react with diphenylcarbazide (DPC) to form a purple-red complex, which is measured spectrophotometrically at a wavelength of 525nm. The standard curve is fitted according to the relationship between absorbance and hexavalent chromium concentration, and the calculation formula is obtained at the same time. When testing the total chromium content in the environmental water samp...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31
Inventor 刘允伟王立田
Owner ANHUI WAYEE SCI & TECH CO LTD
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