Method for determining arsenic and cadmium in donkey-hide gelatin through hydride generation-atomic fluorescence spectrometry

A technology of hydride generation and atomic fluorescence, applied in fluorescence/phosphorescence, preparation of test samples, material excitation analysis, etc., can solve the problems of atomic fluorescence analysis stability, poor reproducibility, large measurement error, etc., and reach the detection limit Low, less basic interference, high sensitivity effect

Inactive Publication Date: 2012-02-08
JIANGSU SKYRAY INSTR
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Problems solved by technology

[0015] High sensitivity and low detection limit are the characteristics of atomic fluorescence analysis. However, sensitivity and stability are mutually restrictive factors. Due to the high sensitivity, the fluorescence signal responds to slight changes in the detection system, so the stability and reproducibility of atomic fluorescence analysis are relatively high. Poor, large measurement error
[0016] Therefore, there is no application of hydride generation-atomic fluorescence method to the determination of trace amounts of arsenic and cadmium in donkey-hide gelatin.

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  • Method for determining arsenic and cadmium in donkey-hide gelatin through hydride generation-atomic fluorescence spectrometry
  • Method for determining arsenic and cadmium in donkey-hide gelatin through hydride generation-atomic fluorescence spectrometry
  • Method for determining arsenic and cadmium in donkey-hide gelatin through hydride generation-atomic fluorescence spectrometry

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Embodiment Construction

[0038] The method for determining arsenic and cadmium in donkey-hide gelatin by hydride generation-atomic fluorescence method comprises the following implementation steps:

[0039] 1. Prepare reagents

[0040] (1) Hydrochloric acid: (analytical pure, 36%, ρ=1.19g / ml).

[0041] (2) Nitric acid: (analytical pure, 65%, ρ=1.42g / ml).

[0042] (3) Perchloric acid: (analytical pure, 70%, ρ=1.67g / ml).

[0043] (4) hydrogen peroxide: (analytically pure, 30%, ρ=1.11g / ml)

[0044] (5) 10% thiourea and ascorbic acid: (analytically pure), weigh 10 g of thiourea and 10 g of ascorbic acid in a beaker, measure 100 ml of ultrapure water, and heat to dissolve.

[0045] (6) Arsenic standard stock solution (1000 μg / ml): provided by the National Standard Materials Research Center.

[0046] (7) Arsenic standard solution (0.1 μg / ml): Use a pipette to draw arsenic standard stock solution (1000 μg / ml) and gradually dilute it to the As standard solution ( 0.1 μg / ml).

[0047] (8) No. 2 special re...

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Abstract

The invention discloses a method for determining arsenic and cadmium in donkey-hide gelatin by means of hydride generation-atomic fluorescence spectrometry. The method comprises: 1) preparing appropriate reductant and current-carrying solutions; 2) setting instrument and measuring parameters; 3) preparing standard blanks of standard substance series of solutions; 4) determining the standard blanks till stabilization of the instrument; 5) measuring the fluorescence intensity of the standard substance series of solutions, and drawing standard curves with concentrations of the standard substance solution series as the independent variables, and fluorescence intensity of the standard substance solution series as the dependent variables; 6) determining the fluorescence intensity of sample blanks; 7) determining the sample fluorescence intensity; 8) calculating the sample concentration according to the sample fluorescence intensity and standard curve equations; as well as conducting sample digestion before step 6 and step 7. The method of the invention has the advantages of high sensitivity, low detection limit, less basic interference, rapidity, simplicity and convenience.

Description

technical field [0001] The invention relates to a method for determining trace elements, in particular to a method for determining arsenic and cadmium in donkey-hide gelatin by using a hydride generation-atomic fluorescence method. Background technique [0002] Donkey-hide gelatin is a jelly made from the skin of a donkey. Medicinal donkey-hide gelatin is a neat rectangle, about 8.5 cm long, 3.7 cm wide, and 0.7 to 1.5 cm thick. Surface brown or dark brown, shiny. The quality is hard and brittle, the cross-section is bright, and the fragments are brown and translucent when viewed from the light. The molecular weight of donkey-hide gelatin is 80,000 to 200,000. After hydrolysis of donkey-hide gelatin, more than 18 kinds of amino acids were detected, of which 8 kinds are essential for the human body. There are 27 trace elements in donkey-hide gelatin, 9 of which are necessary for the human body, among which iron, copper, magnesium, zinc, and strontium are relatively high i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64G01N1/44
Inventor 余正东孙引余丽娟
Owner JIANGSU SKYRAY INSTR
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