氢化物发生-原子荧光光谱法测定中草药中的微量砷

研究了氢化物发生-原子荧光光谱法测定中草药中微量砷的方法的最佳条件，以50g／L硫脲 50g／L抗坏血酸为预还原抗干扰剂，测定了10种中草药药品中的砷，方法检出限(3σ)为0．103μg/L，相对标准偏差为1．6％-3.2％，回收率为89．2％-112％。     

氢化物发生-原子荧光光谱法测定氧化钴中痕量铅

样品经HCl消解,加入硫氰酸钾 草酸 邻菲啰啉混合液抑制大量钴的干扰,在K3Fe(CN)6氧化体系下,实现了无需分离大量钴直接进行氧化钴中痕量铅的氢化物-原子荧光光谱法测定.回收率为91%～107%,检出限为0.56μg/L,线性范围0～80μg/L.用该方法分析氧化钴样品中的Pb,方法简便,结果准确,应用前景良好.     

氢化物发生-原子荧光光谱法测定白酒中的痕量铅

建立氢化物发生-原子荧光光度法测定白酒中痕量铅的方法.对测定铅的影响因素进行分析和研究,优化了仪器的最佳工作参数,确定了最适宜的分析条件.铅标准溶液浓度在0～20.0μg/L范围内,标准曲线具有良好的线性,铅的检出限为1μg/L,回收率为94.0%～108.0%,相对标准偏差为3.28%～4.03%(n=11).     

氢化物发生-原子荧光光谱法测定中草药中不同形态的砷

本文建立了氢化物发生-原子荧光光谱法测定中草药方剂原生药、残渣、悬浮态及可溶态中的三价及五价砷的方法。研究了仪器的工作条件、试剂浓度及不同增感剂对砷原子荧光强度的影响和五价砷的还原条件，探讨了共存离子对砷测定的干扰及消除方法。利用本方法成功地对黄连解毒汤中的砷进行了形态分析。方法检出限为89．1ng／L，RSD为1．24％，样品加标回收率为91．1％～109．3％。     

氢化物发生-原子荧光光谱法测定山野菜中的微量砷

采用氢化物发生-原子荧光光谱法测定山野菜中的微量砷,讨论了硼氢化钾用量、酸介质及其酸度、原子化器温度、载气流量等实验条件。砷含量为1.0~200μg/L时,线性关系良好,方法检出限为0.08μg/L。以50 g/L硫脲-50 g/L抗坏血酸为预还原剂,测定了6种山野菜中的砷,加标回收率为91.6%~104.0%,相对标准偏差为1.4%~2.1%(n=8)。     

顺序注射氢化物发生-原子荧光光谱法同时测定中草药中的铅和锡

建立了一种顺序注射氢化物发生一原子荧光光谱法同时测定中草药中的铅和锡含量的方法,同时讨论了共存离子的干扰情况。结果表明,在最佳实验条件下,铅和锡的检出限分别为0．0253μg／L和0．0425μg／L,加标回收率为95．5％～103．1％,相对标准偏差小于5．2％,被测试样中共存的离子对铅和锡的测定没有干扰。该法操作方便、快速,用于中草药试样中铅和锡的同时测定,具有很好的可行性和实用性。     

氢化物发生-原子荧光光谱法测定低合金钢中微量砷

采用氢化物发生-原子荧光光谱法测定低合金钢中砷的含量。样品经盐酸-硝酸混合酸消解,以盐酸(5+95)溶液为反应介质,15g·L~(-1)硼氢化钾-2g·L~(-1)氢氧化钾的混合溶液为还原剂,采用柠檬酸作为掩蔽剂。砷的质量浓度在60.0μg·L~(-1)以内与荧光强度呈线性关系,方法的检出限(3s/k)为0.023μg·L~(-1)。应用此法对标准钢样进行了分析,测定结果与认定值相符合,可满足钢铁中微量砷(质量分数0.001%～0.04%)的测定要求。     

氢化物-原子荧光光谱法测定高纯铅中微量锑

研究了高纯铅中微量锑的氢化物-原子荧光光谱方法。考察了最佳测定条件、干扰的消除方法及酸度影响。结果表明,采用硝酸溶解样品,蒸至有硝酸铅析出后,加入盐酸酸度达20%时,基体铅以氯化铅形式沉淀,消除基体铅的影响,其它共存离子不干扰锑的测定。检出限(3σ)为0.37μg.L-1,样品加标回收率在95.0%~101.4%之间,RSD为1.73%。     

氢化物发生-原子荧光光谱法测定中草药中的痕量铋

本文报道了采用氢化物-原子荧光法测定中草药中的痕量铋。试验了酸介质和还原剂用量对测定铋的影响,考察了共存金属离子的干扰。在最佳测定条件下,方法检出限为0.1μg/L,线性范围为0.1~200μg/L,加标回收率为91.0%~104.2%。     

氢化物发生-原子荧光光谱法分析钢铁中的微量砷

建立了氢化物发生-原子荧光光谱法分析钢铁中微量砷的新方法。考察了负高压、原子化器高度、载气流速、屏蔽气流速、载流酸和硼氢化钾浓度对测定的影响,优化了测定条件,研究了钢铁中常见元素的干扰效应及消除结果。对于砷的测定,发现EDTA能有效地掩蔽Fe的干扰,而对Mn、Ni、Cu、Mo的干扰用抗坏血酸能有效地进行掩蔽。在选定的实验条件下,方法的线性范围为0～100ng/mL,相关系数r=0.9993,检出限为0.073ng/mL,相对标准偏差为1.7%(n=10)。通过测试国家标准钢样进行方法验证,测定结果与标准值相符。将该法用于普通钢样分析,加标回收率为90.0%～99.5%。     

氢化物发生-原子荧光法测定绞股蓝中痕量铅

建立了以重铬酸钾为氧化剂、碱性铁氰化钾为络合剂, 丙二酸为掩蔽剂, 在盐酸介质中进行铅的氢化物发生的反应体系. 样品经HNO3-H2O2体系高压消解后, 采用断续流动氢化物发生器, 对测定铅的各种条件进行了优化和探讨. 在选定条件下, 方法检出限为3.76×10-7 g/L, 线性范围为0.01～2.00 ×10-4 g/L, 相对标准偏差为1.3%. 方法用于绞股蓝中铅的测定, 回收率为90.5%～101.4%.     

Determination of lead in wine by hydride generation atomic fluorescence spectrometry in the presence of hexacyanoferrate(III)

A rapid, accurate, and precise method is described for the determination of Pb in wine using continuous-flow hydride generation atomic fluorescence spectrometry (CF-HGAFS). Sample pretreatment consists of ten-fold dilution of wine followed by direct plumbane generation in the presence of 0.1 mol L⁻¹ HCl and 1% m/v K₃[Fe(CN)₆] with 1% m/v NaBH₄ as reducing agent. An aqueous standard calibration curve is recommended for Pb quantification in wine sample. The method provides a limit of detection and a limit of quantification of 0.3 μg L⁻¹ and 1 μg L⁻¹, respectively. The relative standard deviation varies between 2–6% (within-run) and 4–11% (between-run) at 3–30 μg L⁻¹ Pb levels in wine. Good agreement has been demonstrated between results obtained by CF-HGAFS and direct electrothermal atomic absorption spectrometry in analyses of red and white wines within the concentration range of 9.2–25.8 μg L⁻¹ Pb.     

Determination of selenium in vegetables by hydride generation atomic fluorescence spectrometry

A digestion mixture of H₂SO₄/HNO₃/H₂O₂/HF/V₂O₅ was investigated for decomposition of plant samples and sensitive detection of selenium was achieved by hydride generation atomic fluorescence spectrometry (HG-AFS). The method was found to be accurate and reproducible, with a low detection limit (DL) (0.14 ng g⁻¹ solution). The repeatability of the determination was mostly around 10%, the reproducibility over a period of 8 months for determination of selenium in the standard reference material Trace Elements in Spinach Leaves, NIST 1570a, was 9% and the relative measurement uncertainty was 7% using a coverage factor of 2.3 at 95% probability. The average recovery of the whole procedure was 90%. The characteristics of this method are simple and inexpensive equipment, low consumption of chemicals and the ability to analyse many samples in a short time. The whole procedure was carried out in the same PTFE tube, and in addition only a simple cleaning procedure is needed. As a consequence of all these advantages, the described method is suitable for environmental and nutritional studies. The selenium content was determined in 44 vegetable samples from different regions of Slovenia and the contents found were in the range 0.3-77 ng g⁻¹ wet weight.     

Determination of total arsenic in seawater by hydride generation atomic fluorescence spectrometry

In this work, the determination of total As in seawater by hydride generation atomic fluorescence spectrometry was studied. The influence of the chemical, flow and instrumental parameters were investigated and optimized. The pre-reduction of As(V) to As(III) was performed using KI plus ascorbic acid in 3.5 mol L^− 1 HCl medium. No multiplicative interference was present and external aqueous calibration could be used. The limit of detection was 36 ng L^− 1, while the repeatability was 2% (n = 10), at a 500 ng L^− 1 concentration level. The sample throughput was 15 h^− 1 if triplicate measurements were made. The accuracy was assessed by the analysis of a seawater certified reference material and excellent agreement between the obtained and certified values was verified. The procedure was used for the analysis of seawater offshore samples collected at the Brazilian coast and results ranging from 860 to 1200 ng L^− 1 were found.     

流动注射在线共沉淀HG-AFS测定痕量铅

建立了流动注射在线共沉淀HG-AFS测定痕量铅的分析方法。方法基于铅在碱性介质中与氢氧化镁共沉淀，沉淀收集在锥形沉淀腔中，用HCl溶洗沉淀和NaBH4反应，产生的氢化物被载气引入原子化器中进行测定。测定铅的RSD为3％(5ng/mL，n=10)，检出限为0．01ng。检出限较直接进样降低了11倍。对国家标准物质中铅的测定结果与标准值相符。     

树脂分离-氢化物发生-原子荧光光谱法测定食品中无机砷、一甲基胂和二甲基胂

建立了用阴离子交换树脂分离-氢化物发生原子荧光光谱法测定食品中无机砷、一甲基胂和二甲基胂的方法.分别从样品上样条件及二甲基胂、一甲基胂、 As(Ⅲ)和As(Ⅴ)分离条件进行了优化.研究了树脂处理程序对分离的影响,并探讨了共存离子对测定砷的干扰和消除的方法.对方法的适用范围做了研究.本方法具有操作简便、快速、灵敏度高等优点.检出限(以砷计)分别为: 无机砷0.34 μg/L,一甲基胂0.57 μg/L,二甲基胂0.46 μg/L.     

氢化物发生-原子荧光光谱法测定蔬菜中的镉

研究了以8-羟基喹啉与钴离子作为协同增效剂,氢化物发生-原子荧光光谱测定蔬菜中镉的方法.得到测镉的最佳条件是: 3%HCl 1 mg/L Co2 5 mg/L 8-羟基喹啉体系.本法线性范围0.5～20 μg/L,检出限为0.03 μg/L,RSD为2.5%.本法应用于测定蔬菜中镉的回收率为92%～105%.     

顺序注射氢化物发生-原子荧光光谱法同时测定中草药中铋和汞

建立了一种顺序注射氢化物发生-原子荧光光谱法测定中草药中的Bi和Hg的方法,讨论了共存离子的干扰情况。在最佳实验条件下,Bi和Hg的检出限分别为0.0057μg/L和0.0197μg/L,加标回收率为93.4%~104.7%,相对标准偏差小于4.3%,被测中草药试样中共存的离子对Bi和Hg的测定没有干扰。方法可用于中草药试样中Bi和Hg的同时测定。     

Determination of arsenic in dinosaur skeleton fossils by hydride generation atomic fluorescence spectrometry

Hydride generation atomic fluorescence spectrometry was for the first time utilized to determine trace toxic element arsenic in the skeleton fossils of four dinosaurs unearthed in Sichuan Province of China. The instrumental limit of detection (LOD) for arsenic was 0.03 μg/L under optimal experimental conditions, which compared favorably to that by ICP-AES and ETAAS. The samples were digested with aqua regia in boiling water bath. The recoveries of standard addition were found to be from 97 to 109%, and the analytical results were found in good agreement with those by ICP-AES. It is a simple, reliable, sensitive yet relatively inexpensive analytical method, compared to ICP-AES, ICP-MS or ETAAS. Interesting analytical results were found that the arsenic concentrations were all abnormally high in the skeleton fossils. The established analytical method and the analytical results may be helpful in revealing the mystery of the mass extinction of the dinosaur fauna. The analytical results, together with other data available to date, supported the argument that the arsenic toxicosis could be a contributing factor for the mass extinction of the dinosaur fauna in Sichuan Province of China.