共查询到20条相似文献,搜索用时 62 毫秒
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甲基异丁基酮负载泡塑富集—原子吸收测定岩矿中痕量金银铊镉 总被引:4,自引:4,他引:4
研究了多种负载泡塑对Au、Ag、Ti、Cd的富集行为。提出了在HCI-KI-抗坏血酸介质中用甲基异丁基酮(MIBK)负载泡塑同时萃取,然后用2%硫脲-1%HCl解脱的富集方法,并采用火焰原子吸收连续测定地质样品中痕量Au、Ag、Tl和Cd,方法的测定下限(μg/g)分别为:0.2g、0.05、0.20和0.04。 相似文献
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用滤纸负载固相反射散射分光光度法测定银 总被引:2,自引:0,他引:2
探讨一种新的固相分光光度法——固相反射散射分光光度法,通过滤纸对银缔合物的分离富集,研究Ag与对二苯胺基卡叉若丹宁形成的缔合物在滤纸相的反射散射吸光度(Ag),从而测定样品中的Ag。实验结果表明,在酸性条件下,Ag(Ⅰ)与若丹宁在表面活性剂介质中形成稳定的缔合物,可以被均匀地抽滤到滤纸相表面,该缔合物最大吸收波长(λ)为590nm;Ag(Ⅰ)质量浓度在O~12μg/25mL范围内,与吸光度呈线性关系;Ag的检出限为0.05μg/mLL,相对标准偏差(RSD)为4.3%。 相似文献
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HNO3分解样品后,直接用火焰原子吸收法测定铋及氧化铋中铜、铅、铁、锡、镍。方法的检出限分别为Cu 0.22μg/g,Pb1.5μg/g,Fe0.39μg/g,Cd0.11μg/g,Ni0.34μg/g。与国标方法进行比较,分析结果基本一致,精密度试验,各元素的RSD(n=6)≤5.2%。 相似文献
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泡沫塑料富集-石墨炉原子吸收光谱法测定地质样品中微量铊 总被引:2,自引:0,他引:2
采用HF-HClO4-HNO3-HCl溶解样品,泡沫塑料富集-石墨炉原子吸收光谱法测定岩石、土壤、水系沉积物等地质样品中微量铊。以抗坏血酸为基体改进剂,Fe^3+加入量选择100mg,灰化温度为600℃,原子化温度为1600℃。方法用于测定国家一级标准物质,结果与标准值基本一致。方法精密度(RSD,n=8)为2.88%~6.27%,回收率为95.24%~101.3%,检出限可达0.058μg/g。 相似文献
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发射光谱法测定勘查地球化学样品中银硼锡钼铅 总被引:21,自引:13,他引:21
以K2S2O7、NaF、Al2O3和炭粉为缓冲剂,Ge为内标,电弧发射光谱法测定勘查地球化学样品中Ag、B、Sn、Mo、Pb。方法检出限为Ag0.013μg/g、B0.83μg/g、Sn0.23μg/g、Mo0.073μg/g、Pb0.37μg/g。方法精密度(RSD,n=12)为Ag4.2%~11.3%、B3.2%~6.5%、Sn2.6%~7.1%、Mo2.9%~6.3%、Pb1.57%~5.18%。测定了国家一级地球化学标准物质,结果与标准值相符。 相似文献
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石墨炉原子吸收分光光度法测定土壤样品中痕量镉 总被引:2,自引:0,他引:2
研究了土壤样品中痕量镉的石墨炉原子吸收分光光度法测定最佳条件以及磷酸二氢铵与硝酸镁作基体改进剂对测定镉的基体改进效应,并比较了两种试样分解体系。方法检出限为0.01pg/L,精密度(RSD,n=8)为3.29%-7.69%,经国家一级标准物质分析验证,结果与标准值符合。 相似文献
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内标和快速共沉淀-火焰原子吸收光谱法测定食盐中的镉 总被引:3,自引:0,他引:3
探讨了用火焰原子吸收法测定以(2-吡啶偶氮)-2-萘酚-Ni(Ⅱ)为共沉淀体系,以Mn(Ⅱ)为内标,在pH=9.0的条件下快速共沉淀分离富集食盐中的痕量Cd。当试液为100mL时,方法的检出限为5.7μg/L,加标回收率为96%~101%,相对标准偏差(RSD,n=6)〈5%,基本消除了基体干扰。 相似文献
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黄原酯棉富集分离—全差示光度法测定痕量银 总被引:1,自引:0,他引:1
在5—35%HClO_4介质中,0.1g黄原酯棉可定量吸附500μg Ag,灰化解脱后Ag回收率在99%以上。Ag-金试剂-OP络合物的显色条件是:pH为4.5—6.5,最大吸收波长505nm,摩尔吸光系数1.0×10~5,络合物组成是Ag:金试剂=1:4,Ag量在0—10μg/25ml范围内符合比尔定律。采用全差示分光光度法测定地质样品中的Ag,操作简单快速、灵敏度高、选择性好、测定范围宽. 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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正1 Introduction Geological studies established on several sections in Lanping-Simao basin have shown that the salt-bearing strata of Mengyejing formation(Yunlong Fm.in Lanping basin)are constituted by an alternation of salt layers and interbedded facies.The latter consists mainly of mudstones,and mudstone-rich conglomerate.The mineralogy and geochemistry of salt-bearing beds and 相似文献
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正On 22nd April 2014,with the approach of the 45th World Earth Day,China’s Ministry of Land and resources issued the status of China’s mineral resources in 2013.The first task of the prospecting breakthrough strategy action implemented in the last five years has been completed,and China’s security capacity for mineral resources has been significantly improved.In the 相似文献
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正There are more than 700 salt lakes with area of more than 1km2 on the Qinghai-Tibet Plateau of China.In recent years,an oilfield brine was also found in the Nanyishan Section of Qaidam Basin in the Qinghai-Tibet 相似文献
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正1 Introduction Physical and numerical models are constructed to investigate the evolution and mechanism of salt migration driven by tectonic processes.In recent years,we have designed and ran series of models to simulate salt 相似文献
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YUAN Qin LI Jianguo QIN Zhanjie WEI Haicheng SHENG Shurong SHAN Fashou 《《地质学报》英文版》2014,88(Z1):276-276
正The study of Cretaceous-Palaeogene salt-bearing strata of the Khorat Basin Laos and the Lanping-Simao Basin in Yunnan,China has an great significance not only in explaining the basin evolution and the genesis of potash 相似文献
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正Potash is one of the long-term scare deposits in China,and potash prospecting has long been listed as a key brainstorm project for our nation and geological prospecting units.There have been considerable studies in search for potash deposits in the Kuqa depression of the Tarim basin(Jackson et al.,1991;Gemmer et al.,2004;Vendeville,2005;Vendeville and Jackson,1992a,1992b), 相似文献
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正1 Introduction Qaidam Basin in Qinghai,including 43 salt lakes with multiple dominant mineral such as potassium,magnesium,lithium etc.,is the most intensive distribution of Saline 相似文献