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
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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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