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Ion chromatography-fluorescence method for detection of sexavalence chromium

An ion chromatography and hexavalent chromium technology, which is applied in the field of ion chromatography-fluorescence detection of hexavalent chromium, can solve the problems of low sensitivity, high cost, and large interference, and achieve the effect of high detection sensitivity and low cost

Active Publication Date: 2016-11-02
江苏出入境检验检疫局轻工产品与儿童用品检测中心
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  • Abstract
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Problems solved by technology

Spectrophotometric detection has large interference and low sensitivity; combined ion chromatography-spectrophotometric detection has low sensitivity; liquid chromatography (or ion chromatography)-inductively coupled plasma mass spectrometer combined detection has good selectivity and high sensitivity , but expensive

Method used

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  • Ion chromatography-fluorescence method for detection of sexavalence chromium
  • Ion chromatography-fluorescence method for detection of sexavalence chromium
  • Ion chromatography-fluorescence method for detection of sexavalence chromium

Examples

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Effect test

Embodiment 1

[0028] Such as figure 1 A method for detecting hexavalent chromium by ion chromatography-fluorescence method is shown, which is a method for detecting hexavalent chromium in water, specifically: the water sample is filtered to form a sample solution, which contains 0.02, 0.05, 0.10 and 0.20 respectively. The aqueous solution of mg / L hexavalent chromium was used as the standard solution, the sample solution and the standard solution were injected sequentially, and the anion exchange chromatography column was used to detect the hexavalent chromium in the sample solution and the standard solution respectively, using 250 mmol / L (NH 4 ) 2 SO 4 and 100 mmol / L NH 4 The mixed solution of OH was used as the eluent to elute the hexavalent chromium on the anion exchange chromatography column, with 1 mM RBH and 1M H 2 SO 4 As a fluorescent derivatization reagent, add a fluorescent derivatization reagent to the separated hexavalent chromium for fluorescence derivation, and detect the p...

Embodiment 2

[0031] Such as figure 1 The method for detecting hexavalent chromium by ion chromatography-fluorescence method is a method for detecting hexavalent chromium in toy paint coatings, specifically: scrape off the paint coating, and obtain it through a metal sieve with an aperture of 0.5mm. 100mg test sample, add a hydrochloric acid solution with a concentration of 0.07mol / L to the test sample, the volume of the hydrochloric acid solution is 50 times the volume of the test sample, heat the hydrochloric acid solution containing the test sample to 37°C and keep it warm. Shake continuously for 1 hour, then place it at 37°C for 1 hour, remove the solid matter, take 2mL of the solution, add 2mL of ammonia solution with a concentration of 0.07mol / L, mix well, and pass the mixture through a hole with a diameter of 0.45μm After filtration with a membrane, it was used as a sample solution, and aqueous solutions containing 0.02, 0.05, 0.10, and 0.20 mg / L hexavalent chromium were prepared as ...

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Abstract

The present invention provides an ion chromatography-fluorescence method for detection of sexavalence chromium in the technical field of chemical detection. The detection method comprises the following steps: (A1)sampling a sample solution and a standard solution; (A2) separating sexavalence chromium in the sample solution and standard solution by ion chromatography column; (A3) by a post-column derivatization system, reacting sexavalence chromium after separation with a fluorescence derivatization reagent for fluorescence derivatization; (A4) detecting the peak area of the derivative fluorescence intensity by a fluorescence detector; (A5) conducting linear fitting on the peak area of the derivative fluorescence intensity in the standard solution with content of sexavalence chromium to obtain a standard curve of the relationship between the peak area and sexavalence chromium content; and (A6) determine the content of sexavalence chromium in the sample solution by the standard curve using the peak area of derivative fluorescence intensity in the sample solution. The invention can effectively analyze the content of the sexavalence chromium content in the samples, such as water or toy, the detection sensitivity is high, and the cost is low.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for detecting hexavalent chromium by ion chromatography-fluorescence method. Background technique [0002] The toxicity of hexavalent chromium is very high, and the requirements for hexavalent chromium are very strict in countries all over the world. In water quality, environment, light industrial supplies, etc., the limit value of hexavalent chromium is very low. At present, the methods used to detect hexavalent chromium include spectrophotometry, ion chromatography-spectrophotometry, liquid chromatography (or ion chromatography)-inductively coupled plasma mass spectrometry (ICP-MS), etc. Spectrophotometric detection has large interference and low sensitivity; combined ion chromatography-spectrophotometric detection has low sensitivity; liquid chromatography (or ion chromatography)-inductively coupled plasma mass spectrometer combined detection has good selectivity and high sensiti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 洪锦清费桂琴陈山丹李敬程玉龙
Owner 江苏出入境检验检疫局轻工产品与儿童用品检测中心
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