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鲜魔芋及其种植土壤中矿物元素的ICP-AES法测定   总被引:2,自引:0,他引:2  
采用电感耦合等离子体原子发射光谱法(ICP-AES)测量了不同产区鲜魔芋球茎及其种植土壤中10种矿物元素的含量,并初步讨论其相关性;采用湿法消化处理样品并考察了不同元素测定的精密度、回收率;测定的相对标准偏差(RSD)均小于2%,回收率为95%-104%,结果可信度高。  相似文献
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Extracting organotin compounds (OTC) from soils is difficult due to the high cation exchange and complexation capacity of soils, and little information about OTC in soils is available. In this study, a new extraction method, combining 1 M CaCl2, 0.1% tropolone, and glacial acetic acid was developed. Recoveries of mono-substituted OTC from spiked plant litter, and soil samples were improved substantially to 40% compared to classical glacial acetic acid extraction commonly used in sedimentology, yielding <10% recovery in C-rich soil samples. Simultaneously, the recovery of other OTC, trimethyllead and monomethylmercury was satisfactory. The recoveries of most species from the spiked litter, upland and wetland soils exceeded 70%. The new method extracted much more organometallics from unspiked organic soils and litter than microwave- and ultrasound-assisted extraction and accelerated solvent extraction, most likely due to exchange of organometallics from the solid phase by Ca2+. The method is simple, highly efficient and with low contamination. Together with GC-ICP-mass spectrometry, the method allows the detection of these organometallics in the pg g−1 range and it is particularly suitable for soil and plant materials with low organometallics contents.  相似文献
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