建立电感耦合等离子体发射光谱法测定土壤中Ba,Cd,Co,Cr,Cu,Mn,Ni,Sr,Pb和Zn 10种重金属的含量。以国家标准土壤样品GSS–1,GSS–2,GSS–3为研究对象,采用硝酸、盐酸、氢氟酸和高氯酸微波消解,赶酸后加入2 m L 2%的柠檬酸溶液作为络合剂...建立电感耦合等离子体发射光谱法测定土壤中Ba,Cd,Co,Cr,Cu,Mn,Ni,Sr,Pb和Zn 10种重金属的含量。以国家标准土壤样品GSS–1,GSS–2,GSS–3为研究对象,采用硝酸、盐酸、氢氟酸和高氯酸微波消解,赶酸后加入2 m L 2%的柠檬酸溶液作为络合剂,在选定的仪器工作条件下测定,10种元素的质量浓度在0~20μg/m L范围内与光谱强度存在良好的线性关系,相关系数均大于0.999,方法检出限为0.01~0.15μg/m L。测定结果的相对标准偏差为0.86%~4.82%(n=6),10种重金属平均加标回收率为95.17%~108.67%。该方法操作简单、稳定性好,适用于土壤中重金属含量的测定,并为络合剂在元素测定中的应用提供参考。展开更多
The role of chloride ions in metal sulfides leaching has been well established by researchers, the complexation of chloride ions was considered to be the main effect of chloride ions. In this work, the complexation of...The role of chloride ions in metal sulfides leaching has been well established by researchers, the complexation of chloride ions was considered to be the main effect of chloride ions. In this work, the complexation of chloride ions was neglected by addition of EDTA, a strong complexing agent. In this way, further study was conducted on the effect of chloride ions. The increase of chloride ions concentration from 0 to 2 mol/L, decreased the open circuit potential of pyrite from 264 to 91 m V. Unless otherwise stated, all potentials in this paper are based on the potential of saturated calomel electrode. At 600 m V, the increase of chloride ions concentration acceleraed pyrite oxidation; at 800 and 1000 m V, however, the increase of chloride ions concentration lowered pyrite oxidation rate, and the proportion of elemental sulfur was also decreased with increasing chloride ions concentration; when chloride ions concentration increased from 0 to 2 mol/L, the proportion of elemental sulfur decreased from 32% to 28.4% at 800 m V, and 7.1% to 2.4% at 1000 m V.展开更多
文摘建立电感耦合等离子体发射光谱法测定土壤中Ba,Cd,Co,Cr,Cu,Mn,Ni,Sr,Pb和Zn 10种重金属的含量。以国家标准土壤样品GSS–1,GSS–2,GSS–3为研究对象,采用硝酸、盐酸、氢氟酸和高氯酸微波消解,赶酸后加入2 m L 2%的柠檬酸溶液作为络合剂,在选定的仪器工作条件下测定,10种元素的质量浓度在0~20μg/m L范围内与光谱强度存在良好的线性关系,相关系数均大于0.999,方法检出限为0.01~0.15μg/m L。测定结果的相对标准偏差为0.86%~4.82%(n=6),10种重金属平均加标回收率为95.17%~108.67%。该方法操作简单、稳定性好,适用于土壤中重金属含量的测定,并为络合剂在元素测定中的应用提供参考。
基金financially supported by Large-scale Scientific Apparatus Development Program of Chinese Academy of Sciences (YZ200720)135 Program of the Institute of Geochemistry, CASOcean 863 Program (2010AA09Z207) of the Ministry of Science and Technology, China
文摘The role of chloride ions in metal sulfides leaching has been well established by researchers, the complexation of chloride ions was considered to be the main effect of chloride ions. In this work, the complexation of chloride ions was neglected by addition of EDTA, a strong complexing agent. In this way, further study was conducted on the effect of chloride ions. The increase of chloride ions concentration from 0 to 2 mol/L, decreased the open circuit potential of pyrite from 264 to 91 m V. Unless otherwise stated, all potentials in this paper are based on the potential of saturated calomel electrode. At 600 m V, the increase of chloride ions concentration acceleraed pyrite oxidation; at 800 and 1000 m V, however, the increase of chloride ions concentration lowered pyrite oxidation rate, and the proportion of elemental sulfur was also decreased with increasing chloride ions concentration; when chloride ions concentration increased from 0 to 2 mol/L, the proportion of elemental sulfur decreased from 32% to 28.4% at 800 m V, and 7.1% to 2.4% at 1000 m V.
