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Method for detecting and analyzing trivalent chromium and hexavalent chromium in water sample simultaneously on line

A technology of trivalent chromium and hexavalent chromium, which is applied in the direction of analyzing materials, material separation, measuring devices, etc., can solve the problems of human health injury, high toxicity, cumbersome steps, etc., to ensure sensitivity and accuracy, fast online measurement, The effect of saving analytical reagents

Inactive Publication Date: 2012-04-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Trivalent chromium is one of the essential trace elements for the human body. It is closely related to lipid metabolism and can increase the decomposition and excretion of cholesterol in the human body. It is an effective component of the glucose energy factor in the body and can assist insulin in utilizing glucose. Physiological functions of preventing and treating diabetes, arteriosclerosis, and high blood pressure, but excessive trivalent chromium will cause great harm to human health, and trivalent chromium is more toxic to fish than hexavalent chromium, when the concentration of trivalent chromium is 0.01 In addition, the trivalent chromium in the water will also accumulate in the bones of fish, thus affecting the human food chain.
The steps of adsorbing and separating Cr(III) and Cr(VI) with ion chromatography column are cumbersome and time-consuming. It is necessary to collect Cr(III) and Cr(VI) eluents separately, concentrate them and then analyze and measure them by atomic absorption spectrometry , cannot realize the online detection of Cr(III) and Cr(VI)

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  • Method for detecting and analyzing trivalent chromium and hexavalent chromium in water sample simultaneously on line
  • Method for detecting and analyzing trivalent chromium and hexavalent chromium in water sample simultaneously on line
  • Method for detecting and analyzing trivalent chromium and hexavalent chromium in water sample simultaneously on line

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Embodiment 1

[0048] The present embodiment prepares carboxymethyl cross-linked starch adsorbent, and the process steps are as follows:

[0049] (1) Preparation of cross-linked starch

[0050] The mass ratio of starch and sodium chloride=10:1, the volume ratio of deionized water and epichlorohydrin=50:3, the sum of starch and sodium chloride mass: the sum of deionized water and epichlorohydrin volume= 40:53, the mass of starch and sodium chloride is measured in grams, and the volume of deionized water and epichlorohydrin is measured in milliliters;

[0051] Mix starch and sodium chloride at normal pressure and room temperature to form a mixed material, then add deionized water and epichlorohydrin to the mixed material and mix uniformly to form a slurry, and then add a 10% KOH aqueous solution Add the slurry and stir for 20 hours. After the stirring time expires, the cross-linked starch is obtained by filtration. The added amount of the KOH aqueous solution is: the volume ratio of the KOH a...

Embodiment 2

[0057] This embodiment prepares low-pressure cation exchange resin, and the process steps are as follows:

[0058] (1) Taking styrene and divinylbenzene as raw materials, taking benzoyl peroxide as a catalyst, the quality of styrene: the quality of divinylbenzene: the quality=600:60:1 of benzoyl peroxide; , divinylbenzene and benzoyl peroxide are put into a reaction vessel, and the polymerization reaction is carried out at normal pressure and 90° C. to generate styrene-divinylbenzene spherical copolymer beads, and the reaction time is 15 hours;

[0059] (2) the styrene-divinylbenzene spherical copolymer beads prepared by step (1) are placed in a reaction vessel, and concentrated H 2 SO 4 , sulfonated at normal pressure and 95°C for 30min under stirring to obtain a low-pressure cation exchange resin, concentrated H 2 SO 4 The amount of addition is: the quality of the beads: concentrated H 2 SO 4 The volume=1:4, the mass of styrene-divinylbenzene spherical copolymer beads i...

Embodiment 3

[0061] In this embodiment, the standard sample is tested to investigate the precision of the method of the present invention. The steps are as follows:

[0062] 1. Preparation of standard samples

[0063] (1) Prepare 100mg / L Cr(VI) standard stock solution: weigh 0.0270g K 2 Cr 2 o 7 Dissolve in deionized water, transfer to a 100mL volumetric flask, shake well, dilute to volume, and set aside.

[0064] (2) Prepare 1000mg / L Cr(III) standard stock solution: weigh 0.7692g chromium nitrate (Cr(NO 3 ) 3 9H 2 O) Dissolve in deionized water, transfer to a 100mL volumetric flask, shake well, dilute to volume, and set aside.

[0065] (3) Prepare a mixed standard sample with a Cr(VI) concentration of 50 μg / L and a Cr(III) concentration of 100 μg / L: Measure 0.050 mL of 100 mg / LCr(VI) standard stock solution and 1000 mg / L Cr(III) standard 0.010mL of the stock solution was transferred into a 100mL volumetric flask, shaken well, and made to volume.

[0066] 2. Preparation of oxidizi...

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Abstract

The invention discloses a method for detecting and analyzing trivalent chromium and hexavalent chromium in a water sample simultaneously on line. The method is implemented under low pressure and comprises the following steps of: arranging a low-pressure ion chromatographic column in a detection and analysis flow path; and performing simultaneous analysis (the spectrum peak of the hexavalent chromium is ahead, and the spectrum peak of the trivalent chromium is behind) by using differential migration (the hexavalent chromium is not adsorbed by the low-pressure ion chromatographic column, but the trivalent chromium is adsorbed by the low-pressure ion chromatographic column) by using different affinities of the hexavalent chromium and the trivalent chromium with the low-pressure ion chromatographic column. In the method for analyzing the trivalent chromium and hexavalent chromium in the water sample simultaneously on line, an analytical instrument is involved, wherein the analytical instrument comprises a sample flow path, an eluent flow path, an oxidation solution flow path, a color development solution flow path, a sampling valve, a sampling ring, an analysis flow path, an optical detector and a computer processing system; and the analysis flow path consists of the low-pressure ion chromatographic column, a first mixer, an oxidator, a second mixer, a reactor, an optical flow cell and a counter pressor which are connected with one another in series sequentially.

Description

technical field [0001] The invention belongs to an analysis method for trivalent chromium and hexavalent chromium in water samples, in particular to a simultaneous online detection and analysis method for trivalent chromium and hexavalent chromium. Background technique [0002] Chromium is a crustal element with an abundance of about 0.02%. It exists in two forms: inorganic chromium and organic chromium, and the inorganic chromium form is the main form. [0003] Among the inorganic compounds of chromium, the most common valence states are trivalent chromium [Cr(III)] and hexavalent chromium [Cr(VI)]. Different valence states of chromium have different effects on environmental toxicity, biological effects and human health. Impact. [0004] Trivalent chromium is one of the essential trace elements for the human body. It is closely related to lipid metabolism and can increase the decomposition and excretion of cholesterol in the human body. It is an effective component of the ...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/50
Inventor 张新申陈姝娟蒋小萍
Owner SICHUAN UNIV
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