石墨炉原子吸收法用于硫酸铜中的铅盐检查

目的建立石墨炉原子吸收法检查硫酸铜中的铅盐。方法检测波长为283.3 nm,灯电流为9.0 mA,狭缝宽度为1.3 nm。结果Pb在10.0~100.0μg.L-1线性关系良好,相关系数为0.998 6,平均加样回收率为97.82%(RSD=0.8%,n=9)。结论方法简单、灵敏度高、结果准确,可用于检查硫酸铜中的铅。     

石墨炉原子吸收法测定食品中铅的分析

食品中铅的测定有石墨炉原子吸收法、火焰原子吸收法、比色法、原子荧光法以及近几年来发展起来的ICP-MS法。其中石墨炉原子吸收法灵敏度高,适合于食品中微量铅的测定。但石墨炉原子吸收法重现性稍差,为了提高其重现性,本文对铅的石墨炉原子吸收法的测定条件及影响因素进行研究,确定了仪器的最佳工作条件。     

石墨炉原子吸收法测定葛根中微量元素铁、铅、铜、锰含量

目的建立石墨炉原子吸收光谱法测定葛根中铁、铅、铜、锰的含量。方法通过优化微波消解条件,采用氘灯背景校正,在同一体系中连续测定不同元素。结果在选定条件下,葛根中铁、铅、铜、锰检出限分别为0.0042μg·mL^-1、0.0052μg·mL^-1、0.0039μg·mL^-1、0.0047μg·mL^-1。方法加样回收率为99.5%～103.0%,RSD为3.2%～4.5%,结论本方法准确、迅速、简便。     

原子吸收石墨炉法测定西黄丸中微量重金属铅和铜

目的：建立西黄丸中微量重金属铅和铜的含量测定方法。方法：采用朱子吸收石墨炉法测定西黄丸中微量重金属的含量。结果：铅、铜的平均回收率分别为97．1％、97．8％;RSD分别为2．3％、2．1％（n=5）。结论：本法操作简便,结果准确。     

原子吸收分光光度法测定30批蛇胆中的汞含量

目的 研究蛇胆中的汞的含量测定。方法 采用酸性介质中用氯化亚锡还原，冷原子法测定。结果 通过测定30批蛇胆中的汞含量，排除掺异物样品，可以基本确定蛇胆中汞的含量范围。结论 方法灵敏、简便。     

石墨炉原子吸收法测定异亮氨酸中的微量砷

目的建立石墨炉原子吸收法测定异亮氨酸中的微量砷。方法检测波长为193.7nm,灯电流为12.0mA,狭缝宽度为1.3nm。结果As在1.0000～50.0000μg.L-1范围内线性关系良好,相关系数为0.9994,平均加样回收率为97.01%(RSD=1.0%,n=9)。结论本文的研究有效控制了异亮氨酸的质量,方法简单、结果准确、灵敏度高。     

微波消解石墨炉原子吸收法测定葛粉中的铅

目的：建立葛粉中铅含量的测定方法。方法：采用微波消解法处理葛粉样品,加入20.0g/L磷酸二氢铵作为基体改进剂,用石墨炉原子吸收分光光度法测定铅含量。结果：加标回收率为95.23%～101.10%,RSD=4.68（n=6）,检出限为10μg/kg。结论：该法简单、快速、准确,可用于葛粉中铅的测定。     

基体改进剂在石墨炉原子吸收法测定黄芪中铅的探讨

目的 石墨炉原子吸收光谱法测定黄芪中铅,选择适合的基体改进剂,能显著降低基体干扰,而铅不致损失,从而有效提高了测定的精密度和准确度.方法 通过比较磷酸二氢铵溶液-抗坏血酸溶液混合液,磷酸二氢铵溶液-硝酸镁溶液的混合液和二氯化钯溶液,作为基体改进剂的分析方法,并优化实验条件,测定黄芪中铅含量.结果 在选定条件下,黄芪中铅检出限在不同的基体改进剂分别为0.0086μg·mL-1,0.0042μg·mL-1、0.0022μg·mL-1.方法 加样回收率为96.5%～103.3%,RSD为2.1%～4.7%.结论 选折二氯化钯作为基体改进剂,可以得到较好的回收率,检出限及精密度,能满足铅测定要求.     

石墨炉原子吸收法测定海藻酸中的微量砷

目的:建立石墨炉原子吸收法测定海藻酸中的微量砷。方法:检测波长为193.7nm,灯电流为12.0mA,狭缝宽度为1.3nm。结果:As在10.000 0~50.000 0μg.L-1范围内线性关系良好,相关系数为0.999 4,平均加样回收率为99.45%(RSD为0.2%,n=9)。结论:本方法有效控制了海藻酸的质量,方法简单、结果准确、灵敏度高。     

微波消解-冷原子吸收分光光度法测定甘草中汞的含量

目的建立甘草中汞含量的测定方法。方法采用微波消解。冷原子吸收分光光度法测定甘草中汞的含量。结果汞元素在0—1．8μg范围内其吸光度与浓度呈良好的线性关系（r=O．9987）,平均回收率为91．2％,ltSD=1．51％。结论本方法测定甘草中汞的含量,方法简便、快速,检测结果准确度、精密度好,能满足甘草中汞含量的测定要求,可用于实际样品的测定。     

Total mercury determination in different tissues of broiler chicken by using cloud point extraction and cold vapor atomic absorption spectrometry

A cloud point extraction (CPE) method has been developed for the determination of total mercury (Hg) in different tissues of broiler chicken by cold vapor atomic absorption spectrometry (CVAAS). The broiler chicken tissues (leg, breast, liver and heart) were subjected to microwave assisted digestion in a mixture of nitric acid and hydrogen peroxide (2:1 ratio), prior to preconcentration by CPE. Various parameters such as the amount of ammonium O,O-diethyldithiophosphate (DDTP), concentrations of Triton X-114, equilibrium temperature, time and centrifugation have been studied in order to find the best conditions for the determination of mercury. For validation of proposed method a certified reference material, DORM-2 was used. No significant difference p > 0.05 was observed between the experimental results and the certified values of CRM (paired t-test). The limit of detection and quantitation obtained under the optimal conditions were 0.117 and 0.382 μg/kg, respectively. The accumulation of Hg in different tissues were found in the order of, liver > muscles > heart. The concentration of Hg in chicken tissues were found in the range of 1.57–2.75, 1.40–2.27, 1.55–4.22, and 1.39–2.61 μg/kg in leg, breast, liver and heart, respectively.     

Determination of total mercury in chicken feed,its translocation to different tissues of chicken and their manure using cold vapour atomic absorption spectrometer

In this study, the contents of total mercury (Hg) present in poultry feed, tissues of broiler chicken and manure were assessed. For this purpose, chicken feeds (five brands), different tissues of broiler chicken of two age groups (1–3 and 4–6 week) and manure samples were collected from five commercial poultry farms of Hyderabad, Pakistan. The Hg concentrations in feeds, chicken tissues (leg, muscle, liver and heart) and manure samples were determined by CVAAS, prior to microwave assisted acid digestion in closed vessels. For validation, a certified reference material, DORM-2 was used. The limit of detection and quantitation were 0.117 and 0.382 μg/kg, respectively The Hg concentration in different chicken feed were found in the range of 8.57–16.5 μg/kg. The concentration of Hg in chicken tissues were found in the range of 2.54–5.54 μg/kg (liver), 1.27–3.86 μg/kg (muscles) and 2.13–3.27 μg/kg (heart). The bioaccumulation factors (BAF) for Hg in different tissues were found in the range of 0.092–0.269. The obtained data shows the high correlation coefficient between feed and manure, while low r-values were obtained between Hg levels in feed and tissues of broiler chicken of two age groups.     

石墨炉原子吸收分光光度法测定化妆品乳液中铬的含量

目的建立石墨炉原子吸收分光光度法测定化妆品乳液中铬的含量。方法采用铬空心阴极灯,微波消解样品,测定条件:波长357.9 nm,狭缝0.7 nm,灯电流10 mA,石墨炉原子化器,保护气为氩气,氘灯背景校正系统。结果铬浓度在2~50 ng/ml范围内线性关系良好(r=0.9993,n=6),平均加样回收率为98.2%,RSD=0.7%(n=6)。结论该方法灵敏、准确、可靠,可用于化妆品乳液中铬的含量测定。     

石墨炉原子吸收光谱法测定尿铅的不确定度分析

目的分析石墨炉原子吸收光谱法测定尿铅过程中不确定度的主要来源,找出关键的影响因素,为实验室质量控制提供一定的理论依据。方法采用石墨炉原子吸收光谱法测定尿液中铅的浓度,同时构建数学模型,对各部分分量进行分析。结果对于尿样中铅浓度为25.15μg/ml的样品,取包含因子k=2,其扩展不确定度为1.2μg/ml,最终报告尿铅含量（334.5±12.0）μg/L;同时对影响测定结果的不确定度的各部分因素进行了量化,标准储备液及稀释校准过程引入的不确定度u（sta）为5.13×10^-3;样品制备过程引入的不确定度u（pre）为4.56×10^-3;标准曲线拟和引入的不确定度u（C0）为0.0187;重复条件下的标准偏差u（ ）为3.60×10^-3。结论影响尿铅测定结果不确定度的主要因素是工作曲线拟合引入的误差。     

火焰原子吸收分光光度法测定常通口服液中的微量元素铁

目的测定中药常通口服液中微量元素铁的含量。方法采用火焰原子吸收分光光度法。结果Fe在10~50μg.L-1浓度范围内线性关系良好(r=0.9997),平均回收率为99.16%(RSD=2.28%,n=5)。结论方法简便、灵敏。     

天然药物中硒的正交设计石墨炉原子吸收测定

目的:建立天然药物中硒的含量测定方法。方法:应用正交设计法优化石墨炉原子吸收光谱硒的分析条件,特别是混合基体改进剂和石墨炉工作参数的选择。结果:线性范围为5～100ng/ml,相关系数r=0.9994,相对标准偏差RSD<10％,用国家标准物质检验本方法,准确度和精密度良好。结论:本方法适合天然药物中硒的测定     

石墨炉原子吸收分光光度法测定莪术油注射液中重金属铅的含量

目的测定莪术油中重金属铅的含量。方法石墨炉原子吸收分光光度法。结果重金属铅在0．025—0．15μg／ml浓度范围内线形关系良好（r=0．9995）,平均回收率为99．20％（n=5,RSD=2．06％）,莪术油注射液中重金属铅含量符合规定。结论本法简单、快捷、灵敏。     

Superiority of nitric acid for deproteinization in the determination of trace lithium in serum by graphite furnace atomic absorption spectrometry

Physiological level of trace lithium in human serum was determined by graphite furnace atomic absorption spectrometry (GFAAS). 3.5% HNO₃ (v/v) was employed as a protein precipitant for sample treatment and at the same time verified as a very effective chemical modifier to eliminate the interference of chloride. The analytical conditions for lithium determination in serum were investigated and the optimal pyrolysis and atomization temperatures were 800 °C and 2700 °C. The accuracy and precision of the method were tested by determining lithium in a RANDOX HN1530 assayed human multi-sera and a pooled human serum. The result was in good agreement with the target value and CV of the pooled human serum was 4.74% (n = 10). The characteristic mass, the limit of detection (LOD) of the proposed method were 0.8 pg and 0.01 μmol/L, respectively. Median ± S.E.M. of serum lithium in 220 Chinese people was 0.25 ± 0.02 μmol/L.