微波消解-冷原子荧光法测定大米中汞

本文研究了以微波消解,冷原子荧光法测定大米中汞的最佳测定条件,汞含量在(0～20.0)ug.L-1范围内呈线性关系,相关系数为0.99993,检出限为0.008ug.L-1,方法应用于大米中汞的测定,样品加标回收率在97.6%～107.0%之间,相对标准偏差在1.7%-5.7%之间.     

冷原子荧光法测定土壤中的痕量汞

应用1:1的王水处理试样,氢化物发生一冷原子荧光光谱法测定土壤中的痕量汞。本法具有仪器结构简单,元素选择性好,并具有较高的灵敏度和较好的重现性。结果令人满意。     

微波消解-氢化物原子荧光法测定海水与表层底泥中的痕量汞

采用微波消解一氢化物原子荧光光谱法,测定了福清市沿海周边地区的海水与表层底泥样品中的汞含量.对实验条件进行了优化,改进了传统消解方法中试剂用量大、手续繁琐、易交叉感染等不足.实验同时对海水与表层底泥的测量检出限及方法回收率进行试验,结果表明在优化的实验条件下海水与表层底泥汞的检出限分别0.0005μg/L和0.0317...     

微波消解-冷原子吸收法测定纸巾纸中的汞含量

采用微波消解技术处理样品,冷原子吸收法测定纸巾纸中的汞含量。对样品前处理中消解体系和消解条件进行讨论,确定了最佳使用条件。结果表明,该方法的回收率达到91.64%~102.66%,适用于纸巾纸中汞含量的检测。     

原子荧光法测定聚合氯化铝中的汞含量

采用原子荧光法测定聚合氯化铝中的汞含量。实验结果表明,平均回收率为96．0％,相对标准偏差为1．8％,此法准确、简便、灵敏度高。     

关于双发色体聚品成色剂的研究

本文扼要总结了关于双发色体聚品成色剂的研究工作，证实双发色体聚品成色剂在调节色光，和胶片细部性能方面与单发色体聚品成色剂比较有着更大优越性。     

氢化物-原子荧光法测定矿泉水中的砷和汞

采用AFS-820双通道原子荧光光度计建立了氢化物—原子荧光法同时测定矿泉水中砷和汞的方法。矿泉水用溴酸钾—溴化钾消解,通过原子荧光法光度计同时测定样品中砷和汞。研究了仪器条件、酸度、KBH4浓度等因素对测定的影响,在最佳工作条件下,砷和汞的检出限分别为0.02μg/L、03μg/L,回收率分别为(95.0~100.5)%(、97.4~105.0)%,相对标准偏差分别为0.98%、0.79%。方法简便、准确、灵敏度高。     

冷原子荧光光谱法测定化妆品中汞

结合SYG-Ⅱ型智能冷原子荧光测汞仪的技术结构特点,采用氯化亚锡作还原剂,用冷原子荧光光谱法对化妆品中汞的测定方法进行研究。指出了载气流速、酸浓度和氯化亚锡浓度等因素对检测结果的影响,并对各种影响因素进行优化.研究结果表明:在最佳条件下,化妆品中汞浓度在0～2.0μg.L-1范围内具有良好的线性,相关系数>0.9994。此方法相对标准偏差小于3.52%,检出限为0.02μg.L-1,回收率在(83～107)%之间。     

微波消解-氢化物原子荧光光谱法同时测定金华火腿中砷和汞研究

为提高金华火腿中砷和汞的检测水平，建立了微波消解-氢化物原子荧光光度法同时测定火腿中砷和汞的方法。确定了微波消解样品的条件，优化了仪器的最佳工作参数。在最佳的试验条件下，0～10．0μg．L^-1砷和0～2．0μg．L^-1汞标准溶液，标准曲线具有良好的线性，砷、汞的检出限分别为：砷0．073μg．L^-，汞0．0055μg．L^-1；回收率砷在90．0％。110．0％之间、汞在95．0％～1．10．0％之间；相对标准偏差砷为1．26％，汞为3．08％。     

微波消解-原子荧光法测定食品中的砷

目的:建立测定食品中砷的微波消解原子荧光法。方法:采用微波消解处理样品,原子荧光法分析测定。结果:砷标准系列浓度在(0~8.0)ng/ml范围内线性关系良好。本方法检出限为0.11 ng/ml样品中砷回收率为88.0%~93.2%,具有简便、快速、灵敏、准确的特点。结论:本方法测定结果令人满意,具有一定的实用价值。     

微波消解-氢化物发生原子荧光法测定土壤中硒

本研究采用了微波消解和传统电热板消解土壤样品,用原子荧光法测定土壤中的硒含量,结果表明,微波,消解的方法对总硒测定结果准确而稳定,而且节约时间和试剂。     

应用AFS-2202a型双道原子荧光光度计测量水样中微量As

本文应用AFS-2202a型双道原子荧光光度计测量水样中微量As,研究了原子化器高度、负高压、载气流速、NaBH4浓度、酸度等条件对检出限及精密度的影响,寻求最佳仪器工作条件、测量条件等。     

微波消解-冷原子荧光光谱法测定V2O5-WO3/TiO2系脱硝催化剂中汞的含量

该文采用酒石酸+氢氟酸+硝酸体系微波消解处理V₂O₅-WO₃/TiO₂脱硝催化剂试样,以氢化物发生-冷原子荧光光谱法(HG-AFS)测定其中汞的含量。文中探讨原子化器炉温、原子化器高度、载气及屏蔽气流量及硼氢化钾-氢氧化钠浓度等关键参数对汞测定的影响,并通过系列试验确定上述关键参数的最优解:还原剂浓度为0.2 g/L(硼氢化钾)–2.0 g/L(氢氧化钠),载气和屏蔽气流量分别为600 mL/min和800 mL/min,原子化器炉温200℃,原子化器高为10 mm。共存元素干扰试验表明,在该实验条件下,少量As(Ⅲ)的干扰可加入高锰酸钾(1.0 g/L)将其氧化成As(Ⅴ)得以消除,Pb(Ⅱ)的干扰可加入1.0 mL硫酸(1+5)生成硫酸铅沉淀消除。汞的浓度在0~2.0μg/L范围内线性相关系数为0.9997,方法检出限为0.02μg/L。方法用于实际样品分析,相对标准偏差(RSD,n=7)小于4.0%,加标回收率为95%~104%。     

Preconcentration, speciation and determination of ultra trace amounts of mercury by modified octadecyl silica membrane disk/electron beam irradiation and cold vapor atomic absorption spectrometry

Mercury (II) and methyl mercury cations at the Sub-ppb level were adsorbed quantitatively from aqueous solution onto an octadecyl-bonded silica membrane disk modified by 2-[(2-mercaptophyenylimino)methyl] phenol (MPMP). The trapped mercury was then eluted with 3ml ethanol and Hg2+ ion was directly measured by cold vapor atomic absorption spectrometry, utilizing tin (II) chloride. Total mercury (Hgt) was determined after conversion of MeHg+ into Hg2+ ion by electron beam irradiation. A sample volume of 1500ml resulted in a preconcentration factor of 500 and the precision for a sampling volume of 500ml at a concentration of 2.5microgl(-1) (n=7) was 3.1%. The limit of detection of the proposed method is 3.8ngl(-1). The method was successfully applied to analysis of water samples, and the accuracy was assessed via recovery experiment.     

原子荧光光谱法测定水产品中汞的条件选择及应用

参照食品中总汞及有机汞测定标准，对采用原子荧光光谱法测定食品中总汞的几个主要测定参数进行探讨。测定结果表明，在一定含汞量的范围内，该方法灵敏稳定，各种干扰大大降低，检出限0．15μg／L，标准曲线最佳线性范围0μg/L-60μg／L；线性相关系数（r）0．9999，RSD4％。平均标准回收率97—109％。方法快速、准确，实用性强。     

微波密封消解--原子荧光光谱法测定尿中汞

本文采用微波密封消解尿样,以原子荧光光谱法测定尿汞。与目前广泛采用的尿汞测定方法相比,具有操作简单、灵敏度高、线性范围宽等优点。是理想的测定尿汞的方法,尤其适用于大批量样品的检验。     

Determination of trace metals by atomic absorption spectrometry after coprecipitation with europium hydroxide

A procedure for the determination of trace amounts of chromium(III), iron(III), lead(II) and manganese(II) is described, that combines atomic absorption spectrometry-europium hydroxide coprecipitation. The influences of analytical parameters including amount of europium(III), amount of ammonia, sample volume, etc. were investigated on the recoveries of analyte ions. The effects of concomitant ions were also examined. The recoveries of the analyte ions were in the range of 95-104%. The detection limits (3 s) were in the range of 1.7-17.1 microg/L. The validation of the presented coprecipitation procedure was performed by the analysis of Bovine Liver 1577-b and BCR-144R Sewage Sludge (domestic origin) standard reference materials. The method was applied to the determination of analytes in real samples including natural waters and some food, soil and fertilizer samples, etc. and good results were obtained (relative standard deviations < 10%, recoveries > 95%).     

原子荧光法烟叶土壤砷的测定

本文应用原子荧光法测定了福建省不同地区烟叶土壤中的砷,对仪器条件和试剂使用进行研究,得到检出限为0.079μg/L,相对标准偏差1.45%,加标回收率为92%-105%,结果表明该法操作简便,准确度高,精密度好。     

氢化物发生-原子荧光光谱法同时测定食盐中的砷和汞

建立一种氢化物发生-原子荧光光谱法同时测定食盐中砷和汞的方法.研究样品前处理对测定结果的影响,探索同时测定砷、汞的最佳实验条件.优化条件下,砷、汞质量浓度分别在0～10.0 μμg/L和0～2.0μg/L范围内,线性关系良好.方法检出限:As为0.0043 μg/L,Hg为0.003 2 μg/L;相对标准偏差:As为0.37％,Hg为0.61％;样品加标回收率:As为97.80％ ～ 102.40％,Hg为96.78％～ 100.80％.试验表明:该方法具有操作简便、快速、准确度高等优点,可用于食盐中砷汞的同时测定.     

Determination of trace lead in water samples by continuous flow microextraction combined with graphite furnace atomic absorption spectrometry

A new method of continuous flow microextraction (CFME) combined with graphite furnace atomic absorption spectrometry (GFAAS) was proposed for the determination of trace lead in water samples. A drop of 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) dissolved in benzene is injected into a glass chamber by a microsyringe and held at the outlet tip of a PTFE connecting tube, the sample solution flows right through the tube and the glass chamber, the solvent drop interacts continuously with the sample solution, and the analyte was extracted into the drop and concentrated. After extracting for a period of time, the drop was retracted into the microsyringe and directly injected into graphite furnace for determination of Pb. Several factors affecting the extraction efficiency, such as solution pH, sample flow rate, drop volume and extraction time, were optimized. Under the optimized conditions, a concentration factor of 45 was achieved, and the detection limits for Pb were 12 pg mL(-1). The relative standard deviation for six replicate analyses of 10 ng mL(-1) Pb was 6.8%. The proposed method was applied to determine of trace Pb in water samples with satisfactory results.