Introduction Geological resource survey demands for determining various constituents including major, minor, micro, trace and ultra-trace levels of elements for preparing the map of resource distribution of our count...Introduction Geological resource survey demands for determining various constituents including major, minor, micro, trace and ultra-trace levels of elements for preparing the map of resource distribution of our country. As a powerful and popularly used technique for multi-element analysis, inductively coupled plasma（ICP） atomic emission spectrometry （AES） has been applied to this field for a period of time. However, ICP spectrometric determination of those micro, trace and ultratrace elements needs enrichment procedures for improving the detection limit, which is unacceptable in case a great mass of samples should be analyzed as that in the task of geological resource survey. On the other hand, although ICP mass spectrometry （MS） is considered the most powerful method for trace elements determination, it is difficult for ICP-MS to be used to determine the trace and major analytes simultaneously in a spectrum.展开更多
文摘Introduction Geological resource survey demands for determining various constituents including major, minor, micro, trace and ultra-trace levels of elements for preparing the map of resource distribution of our country. As a powerful and popularly used technique for multi-element analysis, inductively coupled plasma（ICP） atomic emission spectrometry （AES） has been applied to this field for a period of time. However, ICP spectrometric determination of those micro, trace and ultratrace elements needs enrichment procedures for improving the detection limit, which is unacceptable in case a great mass of samples should be analyzed as that in the task of geological resource survey. On the other hand, although ICP mass spectrometry （MS） is considered the most powerful method for trace elements determination, it is difficult for ICP-MS to be used to determine the trace and major analytes simultaneously in a spectrum.
文摘提出了加速溶剂萃取联合凝胶色谱净化-气相色谱-质谱法同时测定土壤中21种酚类化合物含量的方法。取研细过筛后的土壤样品(含水率15%~20%)10 g,加入6 g硅藻土混匀并研磨,置于萃取罐中,以体积比2∶1的二氯甲烷-正己烷混合溶液于120℃进行加速溶剂萃取,萃取液经无水硫酸钠脱水,再用二氯甲烷充分淋洗无水硫酸钠,合并全部有机相,浓缩至1 m L,通过凝胶色谱进行净化,收集9~18 min的流出液,浓缩至1 m L,在HP-5MS色谱柱上按照柱升温程序分离,质谱分析采用全扫描(SCAN)模式。结果表明,21种酚类化合物的质量浓度在2.50~50.0 mg·L^(-1)内与对应的峰面积呈线性关系,检出限(3.143s)为0.02~0.07 mg·kg^(-1)。按照标准加入法进行回收试验,回收率为73.4%~107%,测定值的相对标准偏差(n=6)均不大于17%。方法用于2份土壤样品分析,21种酚类化合物均未检出。方法用于土壤质控样品分析,21种酚类化合物的测定值均在认定值的不确定度范围内。
