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天然水中微量稀土元素镧的流动注射在线预浓集ICP光谱法测定 总被引:1,自引:0,他引:1
本文采用P507萃淋树脂为固定相,应用流动注射(FI)在线预浓集技术,建立了镧的ICP发射光谱分析方法,对天然水中的微量镧进行了测定,获得满意结果。 相似文献
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M.Salah Uddin 《中国科学B辑(英文版)》2009,(5)
Sphingomonas xenophaga QYY, capable of growing significantly on more than ten kinds of aromatic compounds as sole carbon source, was used to study characterization of catechol 1,2-dioxygenase (C12O) in cell extracts. Characterization of the crude C12O showed that the maximum activity was obtained at 40-70℃ and pH 7.8-8.8. Metal ions had different influences on the activity of crude C12O. It was suggested that strain QYY possessed an inducible and ferric-dependent C12O. Kinetic studies showed that the value ... 相似文献
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XU Xiao hua * YAO Guang min LU Jian hua LI Yan ming CHANG Jiang linInstitute of Elemento Organic Chemistry Nankai University Tianjin P.R. ChinaKONG Chui huaInstitute of Tropic Subtropical Ecology South China Agriculture Unive 《高等学校化学研究》2002,(2)
IntroductionTheredalgaofgenusLaurenciaiswell knowntobeusedtoproduceterpenoidsandC15acetogeni ue[1— 3] .WeinvestigatedthetropicalredalgaLau renciamajuscula ,colletedfromtheXishaIslandsintheSouthChinaSea ,andisolatednaturallyoccurringtricyclesesquiterpene ,poly… 相似文献
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ZHU ShuZhen LIU Man TIAN ShengYan & ZHU LingYan College of Environmental Science Engineering Nankai University Key Laboratory of Pollution Processes Environmental Criteria Ministry of Education Tianjin Key Laboratory of Urban Ecology Environmental Remediation Pollution Control Tianjin China 《中国科学:化学》2010,(5)
Bioaccumulation of penta-BDE(DE-71) in earthworms(Eisenia fetida) and the induced toxicities on the growth and reproduction of earthworms were investigated.All the major congeners in DE-71 could be bioaccumulated in earthworms and the concentration found in earthworms correlated to the spiked concentration in soil.DE-71 might inhibit the growth and reproduction of cocoons and juveniles of earthworms.The toxicities were dose dependent and increased with exposure time.Exposing earthworms to combination of DE-... 相似文献
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土壤中常量及微量元素的ICP光谱分析 总被引:1,自引:0,他引:1
本文叙述了土壤中Ca、Mg、Na、Sr、Ba、Mn、Fe、V、Cr及Ti等元素简单快速的ICP-AES测定方法。用HClO_4、HNO_3及HF在聚四氟乙烯高压罐中溶解祥品,用H_3BO_3络合过量的HF。采用基体匹配法校正干扰。方法的准确度、精密度及检出限均较好。 相似文献
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本文采用双柱在线离子交换预浓缩FIA-ICP系统,建立了水及土壤浸出液中痕量钼的测定方法。用内装Dowexl(Cl^-1型)阴离子交换树脂微型柱吸附待测元素,然后用洗脱剂(1.9mol/L氯化铵-0.4mol/L柠檬酸铵混合液^[5])洗脱。在采样频率为12样/小时的速度下,浓缩倍数可达50倍。样品(自来水)回收率为90-110%;在0.2μg/ml水平时,变异系数为5.3%(n=11)。 相似文献
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A novel hydroperoxide cembrane-type diterpenoid was isolated from the soft coral Sarcophyton crassocaule collected from the Xisha Islands in the South China Sea. The structure of 3 was established by spectroscopy and X-ray diffraction analysis,named as sarcophyocrassolide A. It exhibited strong cytotoxicity against the P-388 cell line with IC50 value of 0.1 μg/mL. 相似文献
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流动注射氢化物发生原子吸收法测定血液中硒 总被引:2,自引:0,他引:2
采用流动注射分析与氢化物发生原子吸收相结合的方法测定了血液中痕量硒。采用HNO3-HClO4体系溶解样品,取样量少,样品处理简单,快速。本法检出限为0.06μg/L^-1(3σ),进样频率为120-150样次/小时。讨论了砷对硒测定时的干扰及其排除方法,用该法测定了300个正常人全血和75个血清样品,其硒含量范围分别为0.056-0.118μgm1^-1和0.040-0.076μgm1^-1,回收 相似文献
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