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81.
利用top-down技术评定ICP-MS法测定水中镉的测量不确定度 总被引:4,自引:1,他引:3
根据不同分析人员在连续30周内水质中镉实验室质控样品的分析数据,采用top-down技术中的控制图法评定电感耦合等离子体质谱(ICP-MS)法测定水中镉的不确定度。方法依据《生活饮用水标准检验方法金属指标》(GB/T5750.6—2006 1.5)测定镉质量浓度为2.00μg/L的质控样品,测定均值为2.010μg/L,通过评定,不确定度为0.100μg/L。 相似文献
82.
ICP-MS法测定水稻田表层土壤中重金属元素Zn、Cd、Pb、Cu、Cr、Mn的研究 总被引:13,自引:1,他引:13
报道了用ICP-MS法直接测定水稻田表层土壤中的重金属元素Zn、Cd、Pb、Cu、Cr、Mn含量的方法.土壤样品经HNO3-HF-HClO4彻底消化后,加入内标元素45Sc、115In、204Tl,采用内标法进行测定,有效地克服了基体效应、接口效应及仪器波动所产生的影响;通过优化仪器的工作参数,选择待测元素适当地测定同位素,有效克服了因质谱干扰所带来的影响.对污染土壤标准物质(编号GBW08305)进行测定,测定结果与标准值相吻合.该方法的加标回收率是98.0%~102.0%,相对标准偏差是2.2%~3.5%,具有线性范围宽、简单、快速、准确等特点. 相似文献
83.
84.
Bruna M. Freire Tatiana Pedron Camila N. Lange Livia R. Sanches Gustavo R. M. Barcelos Walter R. P. Filho 《毒物与环境化学》2013,95(4):395-412
A fast, high-throughput and accurate method was developed for determination of Al, As, Ba, Cd, Co, Cr, Cs, Cu, Fe, Mn, Ni, Pb, Se, U, Zn, Sb, Sn, I and Hg in urine and serum by inductively coupled plasma mass spectrometry. The samples were directly analyzed after 1/20 (v/v) dilution in 0.4% (v/v) HNO3 and 0.005% Triton X-100. Three calibration modes were tested: aqueous and matrix matching with urine and serum. The accuracy was tested using reference materials of serum, urine and spiking. Results showed that the use of matrix matching calibration reduced the interferences and improved the recoveries for Al, Co, Pb and I in urine. The matrix matching did not affect the results considerably for serum. When serum was spiked with As, Co, Cs, Pb, U, Hg, I, Ba, Al, Cr and Ni, only matrix matching presented good recoveries. Helium was used as a collision cell gas reducing effectively polyatomic interferences for Al, Mn, Cu, Ni, Cr, Zn, As and Fe. Selection of the best internal standard was carried out for each element. The use of diluted HNO3 improved the limit of detection. Finally, the method was applied successfully in samples of urine from workers occupationally exposed. 相似文献
85.
系统采集了我国东北地区132个表层土壤样品,采用混合酸全溶分解样品,使用UTEVA萃取色谱分离样品溶液中的铀,应用串联四极杆电感耦合等离子体质谱(ICP-MS/MS)测量样品溶液中238U、235U、234U,获得了研究区域表层土壤中3种铀同位素浓度水平和分布.首次大范围报道该地区表土中234U水平,发现在部分土壤中234U发生明显的同位素分馏.235U/238U原子比值分布显示区域大气核武器试验的放射性颗粒物在山脉迎风坡有明显沉积,导致大兴安岭等山脉的西侧235U/238U原子比值较高.但该区域铀同位素整体上处于环境本底水平,受人类核活动影响较小.来源分析表明研究区域表土中铀主要来源于成土母岩的岩石风化以及人类的工业和农业活动. 相似文献
86.
87.
采用ICP—MS法对饮用水中的铅进行了分析测定。并进行了载气流量的选择、定量离子质荷比的选择和内标的选择等实验.本实验铅的质荷比选用206,207和208三个加在一起计算。方法的检测限为0.5×10-3mg/L,精密度实验的变异系数为3.25%~7.63%。 相似文献
88.
ICP-MS半定量分析及其应用 总被引:1,自引:0,他引:1
ICP-MS具有等离子发射光谱检测能力高、测量速度快、测量元素多等特点,能对样品中存在元素进行定性及半定量分析,半定量分析准确度为±30%.同时还能快速确定样品中存在的元素及浓度范围. 相似文献
89.
90.
A robust and rapid methodology for the determination of iodine by inductively coupled plasma mass spectrometry in environmental
samples is presented. Data were initially obtained for the validation of the analytical measurements, using 17 commercially
available soil reference materials. The methodology was then tested on soil and water samples collected in Afghanistan where
iodine deficiency and its effects are reportedly prevalent. Sample collections were conducted in Greater Kabul; the iodine
in agricultural soils was determined to be in the range of 1.6–4.2 mg/kg and that in water drawn for drinking and irrigation
was found to range from 9.9 to 22.7 μg/L. Samples were also collected in a second region, Nangarhar province, which is located
to the east of Kabul, where goitres in the local population had been reported. The iodine content in soils and water at this
location was 0.5–1.9 mg/kg and 5.4–9.4 μg/L, respectively. The organic content of soils in Kabul was found to be in the range
of 1.9–4.2%; in Nangarhar, organic content ranged from 1.7 to 4.5%. All of the Afghan soils were slightly alkaline at pH 7.6–8.2. 相似文献