Interface device and analysis method for inductively coupled plasma mass spectrometer

A volume mass spectrometer and inductive coupling technology, which is applied in the field of interface devices for plasma mass spectrometers, can solve the problems of plasma torch extinguishing, signal instability, and low sensitivity, and achieve improved stability, improved analysis sensitivity, and increased transmission efficiency effect

Inactive Publication Date: 2018-05-01
INST OF QUALITY STANDARD & TESTING TECH FOR AGRO PROD OF CAAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to address the above problems, to provide a tungsten wire capture electrothermal evaporation solid sampling device and an inductively coupled plasma mass spectrometer connection device, the device has a simple structure, and solves the problem of tungsten wire capture electrothermal evaporation solid sampling device and inductive coupling. When the plasma mass spectrometer is used in combination with the problems of plasma torch extinction, unstable signal and low sensitivity, the detection of trace cadmium can be realized without digestion of food samples, which has direct, rapid, high sensitivity and good stability Features

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  • Interface device and analysis method for inductively coupled plasma mass spectrometer

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Effect test

Embodiment 1

[0028] The invention provides a connection device between a tungsten wire capture electrothermal evaporation solid sampling device and an inductively coupled plasma mass spectrometer, the embodiment includes a torch interface (13), a carrier gas mass flow meter (5), an auxiliary gas mass flow meter (6) , a diversion tee (2), a confluence tee (11), a carrier gas pipeline (3), and an auxiliary gas pipeline (4), wherein: the lower right end of the carrier gas pipeline (3) and the auxiliary gas pipeline (4) The gas inlet is connected to the argon-hydrogen mixed gas source (1) by a splitter tee (2), and the carrier gas pipeline (3) is sequentially connected to the splitter tee (2), carrier gas mass flow meter (5), solid sample injection device (7), confluence tee (11), the auxiliary gas pipeline (4) is sequentially connected to the diversion tee (2), the auxiliary gas mass flow meter (6), and the confluence tee (11); the carrier gas mass The right end of the flow meter (5) is conne...

Embodiment 2

[0031] Taking 5 milligrams of rice noodles (national standard GBW10043) as an example, use argon-hydrogen mixed gas containing 4% hydrogen as the gas source, set the carrier gas mass flowmeter (5) to 700mL / min, and set the auxiliary gas mass flowmeter (6) to Set at 300mL / min, use the connection device of the present invention to connect the electrothermal evaporation solid sampling device and the inductively coupled plasma mass spectrometer in series with the tungsten wire capture, and the other conditions are the same as in the first embodiment. The determination of cadmium in the sample is 9.8 ± 0.6 micrograms / kg, within the standard value of the standard substance 12 ± 3 micrograms / kg, the relative standard deviation of multiple determinations is within 10%, high, medium and low (0.1, 0.8 , 2.0 ng) level of standard addition recoveries were all in the range of 85% to 110%.

Embodiment 3

[0033] Take 5 mg of scallop powder (national standard GBW10024) as an example, use argon-hydrogen mixed gas containing 3% hydrogen as the gas source, set the carrier gas mass flowmeter (5) to 700mL / min, and the auxiliary gas mass flowmeter (6) The setting is 300 mL / min, and the connection device of the present invention is used to connect the tungsten wire capture electrothermal evaporation solid sampling device and the inductively coupled plasma mass spectrometer in series, and the other conditions are the same as in the first embodiment. The determination of cadmium in the sample is 971.6 ± 33.7 micrograms / kg, within the standard value of the standard substance 1060 ± 100 micrograms / kg, the relative standard deviation of multiple determinations is within 10%, high, medium and low (0.1, 0.8 , 2.0 ng) level of standard addition recoveries were all in the range of 83% to 107%.

[0034] The above three examples illustrate that the connection device between a tungsten wire captur...

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Abstract

The invention provides an interface device and analysis method for an inductively coupled plasma mass spectrometer. The interface device for an inductively coupled plasma mass spectrometer includes: a torch interface, a carrier gas mass flow meter, an auxiliary gas mass flow meter, Split tee, confluence tee, carrier gas pipeline, auxiliary gas pipeline, etc. The device has a simple structure and solves the problems of plasma extinguishing, unstable signal and low sensitivity when the tungsten wire capture electrothermal evaporation solid sampling device is used in conjunction with an inductively coupled plasma mass spectrometer. The invention has the advantages of realizing the detection of trace cadmium without digesting the food samples, and has the characteristics of directness, rapidity, high sensitivity, good stability and the like.

Description

technical field [0001] The invention belongs to the field of food safety detection, and relates to an interface device and an analysis method for an inductively coupled plasma mass spectrometer for measuring cadmium in food. technical background [0002] At present, the agricultural environment and heavy metal cadmium pollution of agricultural products in some areas of my country are more prominent. In April 2014, the National Soil Pollution Survey Bulletin jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources listed cadmium as the primary pollutant of the soil environment. Cadmium in the agricultural environment will accumulate in the edible part through crop absorption, and enrich in livestock and aquatic products through the food chain, and finally enter the body of consumers to cause harm. After the "cadmium rice" incident in Hunan in 2013, cadmium pollution in agricultural products has always been the focus of consumers and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N27/62G01N27/626
Inventor 毛雪飞王敏张英钱永忠高成玲汤晓艳周剑
Owner INST OF QUALITY STANDARD & TESTING TECH FOR AGRO PROD OF CAAS
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