Analysis of Fluorine in Drinking Water by ICP-QMS/QMS with an Octupole Reaction Cell
Analysis of Fluorine in Drinking Water by ICP-QMS/QMS with an Octupole Reaction Cell
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DOI：
10.2116/analsci.33.1279
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发表时间：
2017-11-01
影响因子：
1.6
通讯作者：
Shikamori, Yasuyuki
中科院分区：
文献类型：
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作者：
Zhu, Yanbei;Nakano, Kazumi;Shikamori, Yasuyuki
用电感耦合等离子体四极杆质谱仪(ICPQMS/QMS)测量BaF+离子，进行氟的分析。优化后的射频功率为1300W，有利于BaF+离子的产生，同时抑制BaOH3+离子的产生。通过对反应池气体的优化，发现当氧气流量为0.65~0.75mLmin(-1)时，BaF+的测定性能最佳。当BaF+浓度不高于100 mg kg(-1)时，BaF+的信号强度与BaF+浓度呈线性关系。金属阳离子的共存，如样品中的Na，可能会抑制BaF+离子在等离子体中的产生，而阴离子可能不会引起这种干扰。将样品调整为10 mg kg(-1)的基质，测得氟的本底当量浓度(BEC)为0.4 mg kg(-1)，检出限(LDL)为0.06 mg kg(-1)。用本方法测定了标准物质(ERM-CA015a)中氟的浓度，其观测值为(1.36+/-0.05)mg kg(-1)，与标准值(1.3+/-0.1)mg kg(-1)相符，两个值均表示为(平均值+/-扩展不确定度)，用于计算扩展不确定度的覆盖系数为(k=2)，置信度约为95%。方法用于实验室采集的自来水样品的分析，回收率在100%左右，重现性好。
The analysis of fluorine was carried out by measuring BaF+ ions with an inductively coupled plasma tandem quadrupole mass spectrometer (ICP-QMS/QMS). After optimization, a radio frequency power of 1300 W was found to benefit for the production of BaF+ ions while suppressing the production of BaOH3+ ions. After optimization of the reaction cell gas, it was found that the best performance for measuring BaF+ could be achieved at a flow rate of O-2 in the range from 0.65 to 0.75 mL min(-1). The signal intensity of BaF+ depended linearly on the concentration of Ba when it was not higher than 100 mg kg(-1). The co-existence of metallic cations, such as Na in the sample, might suppress the generation of BaF+ ions in the plasma, while anions might not cause such a kind of interferences. The background equivalent concentration (BEC) and the lower detection limit (LDL) of fluorine were 0.4 and 0.06 mg kg(-1), respectively, by adjusting the samples to a 10 mg kg(-1) Ba matrix. The concentration of fluorine in a certified reference material (ERM-CA015a) was determined with the present method, for which the observed value was (1.36 +/- 0.05)mg kg(-1), which agreed with the certified value (1.3 +/- 0.1)mg kg(-1), where both values were shown as (mean value +/- expanded uncertainty) with a coverage factor of (k = 2) for calculating the expanded uncertainty giving a level of confidence of approximately 95%. The present method was applied to the analysis of a tap water sample collected in the laboratory, for which the results of recovery tests gave a recovery around 100% with good reproducibility.