Measurement method for chromium VI in water

A determination method and technology of hexavalent chromium, applied in the measurement of color/spectral characteristics, etc., can solve the problems of high consumption of samples, poor anti-interference performance, and reduced water sample volume, etc., and achieve long storage period, convenient storage, and elimination of effect of error

Inactive Publication Date: 2017-05-31
SHANGHAI YIDIAN SCI INSTR +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for the determination of hexavalent chromium in water, which uses diphenylcarbazide spectrophotometry to solve the technical defects of poor anti-interference performance and large sample size consumption in the existing methods for determining hexavalent chromium in water. Measuring hexavalent chromium in water, the whole method is simple and convenient; the reagents are convenient to store and have a long storage period, the volume of the water sample is reduced to one-fifth of the original, reducing the amount of sampling, and the volume of the water sample does not need to be accurately quantified, eliminating the need for unnecessary sampling. The error generated by the accuracy improves the measurement range and linear correlation, and improves the sensitivity and anti-interference

Method used

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Experimental program
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Embodiment

[0021] (I) The preparation method of reagent

[0022] Unless otherwise stated, the reagents used are analytically pure reagents that meet national standards.

[0023] 1. Chromium developer

[0024] Accurately weigh 8.0g of potassium pyrosulfate (K 2 S 2 o 7 ), 2.0g anhydrous magnesium sulfate (MgSO 4 ), grind and mix the above reagents. Then weigh 0.05g diphenylcarbazide (C 13 h 14 N 4 O), added to the above mixture, slightly ground and mixed.

[0025] Weigh 0.1 g of the above mixed reagent, pack it in a moisture-proof bag (the corresponding label is printed on the moisture-proof bag), and store it away from light in a clean, cool, dry, and ventilated place, avoiding direct sunlight and high temperature.

[0026] 2. Chromium calibration solution: ρ(Cr 6+ )=100.0mg / L

[0027] Accurately weigh superior pure potassium dichromate (K 2 Cr 2 o 7 , pre-dried at 110°C for 2h) 0.2829±0.0001g, dissolved in water, transferred to a 1000mL volumetric flask, diluted with water...

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Abstract

The invention discloses a measurement method for chromium VI in water. A diphenylcarbazide spectrophotometric method is used for measuring the chromium VI in water. The whole method has simple measurement steps; reagent can be conveniently stored and has a long storage period, water sample volume is reduced to 1 / 5 of the original volume, a sampling amount is reduced, the water sample volume does not need to be accurately quantified, errors generated due to inaccurate sampling are eliminated, a measurement range and linear correlation are improved, and sensitivity and anti-interference performance are improved.

Description

technical field [0001] The invention belongs to the technical field of substance analysis and detection, and in particular relates to a method for determining hexavalent chromium in water. Background technique [0002] Chromium is one of the trace elements necessary for organisms. The toxicity of chromium is related to its valence state. It is generally believed that the toxicity of hexavalent chromium is 100 times higher than that of trivalent chromium. Hexavalent chromium is easily absorbed by the human body and accumulates in the body. It can It invades the human body through digestion, respiratory tract, skin and mucous membranes. Skin contact may cause sensitivity, and it is more likely to cause genetic defects. Inhalation may cause cancer and has a persistent danger to the environment. [0003] The industrial sources of chromium are mainly the processing of chromium-containing ores, metal surface treatment, leather tanning, textile printing and dyeing, petrochemical, m...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 马丽
Owner SHANGHAI YIDIAN SCI INSTR
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