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1.
采用微型氢化物发生装置-冷原子吸收分光光度法测定了焊锡料及纽扣电池中的汞。在酸性介质中,用硼氢化钾将汞离子还原为汞原子,用载气将汞蒸气导入石英管,原子吸收分光光度计在波长253.7 nm处进行测定。选择了实验条件,对共存离子的干扰等进行了考察。方法的检出限为0.34 ng/mL,11次测定的相对标准偏差(RSD)小于6%,加标回收率为94.4%~104.7%。 相似文献
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试样经650℃灼烧,王水（1＋1）冷浸泡分解试样,利用泡沫塑料富集金,采用硫脲溶液解脱金,用火焰原子吸收光谱法测定矿样中的金,本法适用岩石矿物中0.05×10-9以上金的测定。 相似文献
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壤中气汞量测量方法综述 总被引：1，自引：0，他引：1
回顾了壤中气汞量测量的发展历史，介绍了适用于壤中气汞量测量的原子吸收测汞仪和金膜测汞仪的工作原理，优缺点及测量方法，指出了影响壤中气汞异常的因素和应采取的对策。 相似文献
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样品经盐酸-硝酸分解处理,以硫酸铵为基体改进剂,石墨炉原子吸收光谱法测定地质样品中微量的银.结果表明该方法简便、快速、准确,相对标准偏差（RSD,n=6）为1.89％～6.70％,加标回收率为94％～106％. 相似文献
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应用于水文与工程地质的化探新方法土壤吸附汞地球化学测量 总被引：5，自引：0，他引：5
介绍了化探土壤吸附汞地球化学测量方法的基本原理,指出土壤中汞异常具有多种来源,单一测汞方法不能区别其来源。测汞方法最重要的作用最准确指出汞气的迁移通道－基岩的断裂破碎带。因此该方法更适用于水文与工程地质勘查,特别是地下水勘查。 相似文献
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化探样中的痕量银和镉(0.0xppm)不经分离直接用无火焰原子吸收法测定银和镉是困难的。宫本益夫曾用dowex 1×8阴离子树脂分离和富集电解铜中的银;辽宁地质局中心实验室曾用717阴离子树脂分离和富集化探样中的镉,F.Bea.Barredo和c.Polo polo曾用dowex1×8阴离子树 相似文献
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N.J. Marshall 《Journal of Geochemical Exploration》1978,10(3):307-313
A colorimetric method and apparatus for the determination of arsenic in batches of geochemical survey samples is described. The powdered material can be digested with a perchloric/nitric acid mixture, or most conveniently by an HF/aqua regia attack utilizing aliquots from the same acid solution as used for routine multi-element atomic absorption analyses. Aliquots are treated with potassium iodide and stannous chloride to reduce arsenic to the trivalent state, and arsine is liberated by the action of zinc pellets. The arsine is absorbed in a solution of silver diethyldithiocarbamate in chloroform-quinoline, the reaction being carried out in batches using very simple, inexpensive apparatus which is easily constructed. Detection limits are variable according to aliquot quantities taken, but in routine use working ranges of 1–800 ppm As are readily achieved. Coefficient of variation is 6.6% at the 5 μg As level. The method is shown to be virtually free from matrix interferences commonly encountered in gossans, soils, rocks and many ores. At least 100 powdered samples can be analyzed per man-day. 相似文献
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水浴浸提-氢化物发生-原子荧光光谱法同时测定地质样品中痕量砷和汞 总被引：2，自引：2，他引：0
采用盐酸-硝酸混合酸(盐酸-硝酸-水体积比3∶1∶4)水浴浸取地质样品,在样品消解后的母液中直接加入硫脲-抗坏血酸混合溶液,以氢化物发生-原子荧光光谱法同时测定地质样品中的痕量砷和汞。方法检出限为砷0.033 6 ng/mL,汞0.003 7 ng/mL;相对标准偏差(RSD,n=1)为砷1.1%,汞3.0%。对国家一级标准物质GBW 07109~GBW 07114、GBW 07301~GBW 07312、GBW 07401~GBW 07408中的砷和汞进行测定,测定值与标准值相吻合。 相似文献
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本方法采用硝酸-过氧化氢微波消解,硼氢化钾还原冷原子荧光测定大米中的汞,消解液无需赶酸,直接测汞,方法简便快捷,实验检出限浓度为0.024μg/L,线性范围0～40 ng/ml,经国家一级标准物质验证,方法准确可靠。 相似文献
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电感耦合等离子体发射光谱法和火焰原子吸收光谱法连续测定化探样品中12个元素 总被引：3，自引：3，他引：0
建立了地质化探样品中不同含量和检出限要求的12个元素的连续测定方法。样品经一次取样,用盐酸-氢氟酸-硝酸-高氯酸溶样,电感耦合等离子体发射光谱法测定铜、铅、锌、钴、镍、镉、锶、钡、钒、锰后,加碘化钾-甲基异丁基甲酮萃取分离,火焰原子吸收光谱法测定银、镉。银、镉的相对标准偏差(RSD,n=12)分别为6.5%、4.7%。与现行分析方法相比,建立的方法灵敏度和精密度高、准确度好,降低了生产成本,缩短了检测时间,尤其适合大量化探样品的测定。 相似文献
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壤气汞量测量在我国的应用日趋广泛,迄今使用的原子吸收测汞仪已达数百台,由于金丝捕汞管价格高昂,严重影响了这一方法在生产中的大量应用。本文提出了一种基于以活性炭物理吸附取代常规的汞齐化学吸附的捕汞管,其吸附和脱吸附汞的性能有所提高,可以反复使用,成本大为下降,从而使每一个拥有单波长原子吸附测汞仪的单位均有能力配备足够的捕汞管,开展生产性壤气测汞工作。本文讨论了活性炭搏汞管吸附与脱吸附汞的最佳工作条件及工作方法,干扰的构成原因及排除措施,并且对壤气组份中理论上存在的干扰气体问题进行了试验与讨论。文中给出了二种捕汞管在几个不同矿床上的对比试验结果,还在浙江某金矿远景区进行了应用试验,结果表明活性炭捕汞管与金丝捕示管的地质效果相同。 相似文献
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This article reports the study of the mercury content in solid samples by two variants of atomic absorption spectrometry (AAS): (1) using direct thermal evacuation (desorption) and (2) microwave sample digestion in an aggressive acid medium, with further analysis by AAS. The merits and limitations of each method are considered. It is shown that, unlike express thermal evacuation, acid digestion allows one to analyze a broad range of solid phase samples with a high content of strongly bound mercury, despite the complexity of sample preparation. The two methods indicated above have been well correlated for soil profiles and sediment with a minor content of strongly bound mercury, which allows one to accurately compare the obtained results; the complex use of these methods makes it possible to expand the range of analyzed natural objects and obtain reliable information about mercury contents. 相似文献
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P. S. Harikumar Ph.D. U. P. Nasir M.Sc. M.Phil. in Chemistry M. P. Mujeebu Rahman M.Sc. in Chemistry 《International Journal of Environmental Science and Technology》2009,6(2):225-232
Five sediment cores from the fresh water region of the Vembanad wetland system were studied for the trace element contents The average concentration of iron, manganese, nickel, copper, zinc, cadmium, lead, mercury and chromium were determined. The core samples were collected using gravity type corer, digested with a mixture of nitric acid and perchloric acid and analyzed by atomic absorption spectrophotometry. Heavy metals such as iron, copper, nickel and zinc reported enrichment towards the surface of the core sediment sample collected from the centre of the lake. Lead, cadmium and mercury showed uniform distribution through out the core. Quality of the sediments were evaluated based on sediment quality guidelines, pollution load index, sum of toxic units and with effect range low/effect range median and threshold effect level/probable effect level values of Environmental Protection Agency guidelines. The degree of contamination for each station was determined. The concentration of different heavy metals has been compared with the world average concentration of shale values. Results of the analysis showed that Vembanad lake is facing serious metal pollution with increased rate of deposition. 相似文献
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巯基棉分离富集-原子荧光光谱法测定重晶石中痕量汞 总被引：5，自引：4，他引：1
重晶石样品研磨过筛,用EDTA-氢氧化钠混合溶液络合处理,盐酸调节至弱酸性释放出汞,处理后的样品用原子荧光光谱法测定矿样中的痕量汞。采用巯基棉分离富集有机汞及无机汞,在pH 3~4时巯基棉可充分吸附汞,分别用2 mol/L和6 mol/L盐酸洗脱有机汞和无机汞,并将有机汞转化为无机汞。对影响汞测定的实验条件及干扰元素进行探讨。方法线性范围为0.00~5.00 ng/mL,相关系数为0.999 6;加标回收率为92.0%~114.0%。方法具有简便、快速、基体干扰少、灵敏度高等优点。 相似文献
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RG—1型单波长冷原子吸收热释测汞仪 总被引：9，自引：0，他引：9
介绍了采用“化学选择表面吸附”方法在气路中使用和ＮａＯＨ及Ｎａ２Ｏ２排除固样品热解产生的干扰气体的ＲＧ－１型单波长冷原子收测汞仪,仪器抗干扰能力≥３Ａ,允许直接热解纯硫２０ｍｇ及可能热解释放大量干扰气体的单矿物５０ｍｇ。主要技术眼过了双波长的塞曼原理测汞仪。 相似文献
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用HCl-KClO4-HNO3溶解试样,在10％的氨水介质中,用火焰原子吸收光谱仪于波长328.1nm处,以空气-乙炔火焰测定铜精粉中的银量,克服了酸性体系中测定不稳定的缺点.用铜精粉国家标准物质分析验证,测定结果与标值吻合.方法精密度为2.0％～4.1％,方法检出限为1.3ug/g.方法分析快速简单,易于掌握. 相似文献
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Distribution of arsenic and mercury in subtropical coastal beachrock,Gulf of Mannar,India 总被引：1，自引：0，他引：1
J Dajkumar Sahayam N Chandrasekar S Krishna Kumar G Victor Rajamanickam 《Journal of Earth System Science》2010,119(1):129-135
An assessment of coastal pollution was made on the basis of trace element concentrations (arsenic — As, mercury — Hg) in the
Gulf of Mannar. The beachrock samples were collected along the coastal tracts between Rameswaram and Kanyakumari. The samples
were dried and digested to determine the As and Hg using atomic absorption spectrophotometer (AAS-air-acetylene and nitrous
oxide method). The As and Hg accumulation status of the beachrock was assessed using geo-accumulation index values (I
geo). The accumulation of As and Hg in the beachrock ranges from 2.75 to 20.72 μg g−1 and from 0.06 to 0.31 μg g−1, respectively. The As and Hg concentrations in the beachrocks are compared with crustal average values and average of other
region sediments. The possible source of the contamination is from atmospheric deposition and anthropogenic activities. 相似文献
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泡塑吸附原子吸收法测金探讨 总被引：3，自引：0，他引：3
金泡塑吸附—原子吸收测试方法过程,矿样焙烧、王水溶矿、泡塑直接在含有矿样残渣的溶液中吸附、分离、洗净、炭化、提取,用原子吸收在2428波长处测定。 相似文献