Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Inorganic arsenic extraction method, method for determination of inorganic arsenic in rice and application of inorganic arsenic extraction method

An extraction method and inorganic arsenic technology, applied in the field of chemical analysis and detection, can solve the problems of high purchase and use cost of instruments, time-consuming, poor analysis specificity, etc. Effect

Inactive Publication Date: 2016-10-26
COFCO GROUP +1
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the "Limits of Contaminants in Food" (GB 2762-2012) stipulates that the arsenic in rice must be inspected in the inorganic form, and it cannot be replaced by the total arsenic index in a strict sense.
Currently effective inorganic arsenic detection methods such as the inorganic arsenic hydrochloric acid water bath extraction method proposed in "Determination of total arsenic and inorganic The Determination of Arsenic (GB / T23372-2009) chooses liquid chromatography-inductively coupled plasma mass spectrometry to detect inorganic arsenic. The cost of instrument purchase and use is very high, and it is difficult to promote it on a large scale.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The rice sample was crushed and passed through a 60-mesh sieve, and 1 g of the sample (accurate to four decimal places) was weighed as an extraction sample, and placed in a 50 mL centrifuge tube.

[0033] Add 20mL of inorganic arsenic extract (which contains 4% hydrochloric acid, 8g / L potassium iodide and 4g / L thiourea), mix well and perform ultrasonic extraction in an ultrasonic cleaner at a frequency of 40kHz, a temperature of 70°C, and a time of 40min. After taking out and cooling, centrifuge at 8000r / min for 15min, take the supernatant and filter it through a 0.45μm organic filter membrane to prepare the sample solution to be tested.

[0034] Prepare standard series solutions of As(Ⅲ) with concentrations of 0 μg / L, 1 μg / L, 2 μg / L, 4 μg / L, 8 μg / L, and 10 μg / L, and the constant volume solvent is 4% hydrochloric acid.

[0035] The atomic fluorescence spectrometer is used to sequentially measure standard series solutions, draw a standard curve, and then measure and obta...

Embodiment 2

[0038] The rice sample was crushed and passed through a 60-mesh sieve, and 1 g of the sample (accurate to four decimal places) was weighed as an extraction sample, and placed in a 50 mL centrifuge tube.

[0039] Add 20mL of inorganic arsenic extract (which contains 6% hydrochloric acid, 12g / L potassium iodide and 6g / L thiourea), mix well and perform ultrasonic extraction in an ultrasonic cleaner with an ultrasonic frequency of 40kHz, a temperature of 70°C, and a time of 40min. After taking out and cooling, centrifuge at 8000r / min for 15min, take the supernatant and filter it through a 0.45μm organic filter membrane to prepare the sample solution to be tested.

[0040] Prepare standard series solutions of As(Ⅲ) with concentrations of 0μg / L, 1μg / L, 2μg / L, 4μg / L, 8μg / L, and 10μg / L, and the constant volume solvent is 6% hydrochloric acid.

[0041] The atomic fluorescence spectrometer is used to sequentially measure standard series solutions, draw a standard curve, and then measure...

Embodiment 3

[0044] The rice sample was crushed and passed through a 60-mesh sieve, and 1 g of the sample (accurate to four decimal places) was weighed as an extraction sample, and placed in a 50 mL centrifuge tube.

[0045]Add 20mL of inorganic arsenic extract (which contains 5% hydrochloric acid, 10g / L potassium iodide and 5g / L thiourea), mix well and perform ultrasonic extraction in an ultrasonic cleaner at a frequency of 40kHz, a temperature of 70°C, and a time of 40min. After taking out and cooling, centrifuge at 8000r / min for 15min, take the supernatant and filter it through a 0.45μm organic filter membrane to prepare the sample solution to be tested.

[0046] Prepare standard serial solutions of As(Ⅲ) with concentrations of 0 μg / L, 1 μg / L, 2 μg / L, 4 μg / L, 8 μg / L, and 10 μg / L, and the constant volume solvent is 5% hydrochloric acid.

[0047] The atomic fluorescence spectrometer is used to sequentially measure standard series solutions, draw a standard curve, and then measure and obta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of chemical analysis and detection and discloses an inorganic arsenic extraction method, a method for determination of inorganic arsenic in rice and application of the inorganic arsenic extraction method to inorganic arsenic extraction. The inorganic arsenic extraction method includes that an extracted sample is contacted with an inorganic arsenic extraction liquid which contains hydrochloric acid and a reducing agent, and the reducing agent is selected from one or more of thiourea, potassium iodide and ascorbic acid. By adoption of the hydrochloric acid solution containing the reducing agent as the extraction liquid, steps of extraction and reduction are carried out at the same time, and accordingly pretreatment operations are simplified, and pretreatment time is shortened. In addition, high efficiency and quickness in extraction of inorganic arsenic in the sample can be realized, and accurate quantitative detection of inorganic arsenic is realized as well.

Description

technical field [0001] The invention relates to the technical field of chemical analysis and detection, in particular to a method for extracting inorganic arsenic, a method for determining inorganic arsenic in rice and an application of the method for extracting inorganic arsenic in the extraction of inorganic arsenic. Background technique [0002] As the largest rice producing country in the world, my country is rich in resources, and rice is the staple food in most areas. The safety of rice has also attracted widespread attention from the society. Heavy metal contamination of rice is an important factor causing foodborne diseases. [0003] Among them, arsenic exists in various forms in rice, and inorganic arsenic is the most toxic. Therefore, the "Limits of Pollutants in Food" (GB 2762-2012) stipulates that the arsenic in rice must be inspected in inorganic form, which cannot be replaced by the total arsenic index in a strict sense. Currently effective inorganic arsenic ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N1/28G01N21/64
CPCG01N1/28G01N21/6404
Inventor 时超贾明哲陆金鑫黄蔚霞
Owner COFCO GROUP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com