Determination of Thallium and Its Compounds in Workplace Air by Ultrasonic Extraction-Inductively Coupled Plasma Mass Spectrometry Using No Gas Mode

参数	设定值
RF power	1 550 W
Cool gas flow	15.0 L·min^-1
Auxiliary gas flow	0.90 L·min^-1
Plasma gas	15 L·min^-1
Nebulizer pump	0.1 r·min^-1
Carrier gas	1.05 L·min^-1
Resolution	Standard
Sample lifting speed	0.30 r·s^-1
Sample uptake time	25 s
Dwell time	28 s
Replicate measurements	3
Acquisition mode	Mass spectrogram
Extract lens 2 voltage	-200 V
Omega bias voltage	-80 V
Omega lens voltage	6.4 V
Deflect	13.8 V
Tuning mode	No Gas
Atomizer type	MicroMist

Table 2. Precision and accuracy of proposed method
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Table 2. Precision and accuracy of proposed method
质控样品测定值/μg RSD/% 参考值/μg
1 2 3 4 5 6 7 平均
ZK147 5.68 5.67 5.63 5.64 5.71 5.60 5.72 5.66 0.77 5.9±0.4
ZK148 10.74 10.72 10.68 10.67 10.88 10.86 10.65 10.74 0.86 11.4±0.8

Table 3. Effect of other elements on the determination of thallium
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Table 3. Effect of other elements on the determination of thallium
样品序号加标值/μg 干扰元素测得值/μg 回收率/%
种类含量/μg
1 0.30 As, Pb, Mn, Cd, Hg 1.00 0.32 106.7
1 10 As, Pb, Mn, Cd, Hg 30 9.72 97.2
3 60 As, Pb, Mn, Cd, Hg 180 59.1 98.5

Table 4. Analytical results of samples (n=7)

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Table 4. Analytical results of samples (n=7)

样品编号	本法平均值		国标法平均值		相对误差/%
样品编号	ng·mL^-1	μg·m^-3	ng·mL^-1	μg·m^-3	相对误差/%
1	3.14	0.21	3.34	0.22	6.37
2	18.22	1.21	17.77	1.18	2.47
3	35.61	2.37	35.32	2.35	0.81
4	44.58	2.97	44.35	2.96	0.52
5	12.32	0.82	12.68	0.85	2.92
6	22.49	1.50	22.98	1.53	2.18
7	38.17	2.54	38.42	2.56	0.65
8	9.12	0.61	9.34	0.63	2.41
9	0.94	0.06	0.97	0.06	3.19
10	33.74	2.25	34.22	2.28	1.42

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Fei ZHANG, Xia HUA, Fan YOU, Bin WANG, Li MAO. Determination of Thallium and Its Compounds in Workplace Air by Ultrasonic Extraction-Inductively Coupled Plasma Mass Spectrometry Using No Gas Mode[J]. Spectroscopy and Spectral Analysis, 2021, 41(7): 2279

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