An improved analytical method to determine the content of 52 major, minor and trace elements in marine geological samples, using a HF-HCl-HNO_3 acid system with a high-pressure closed digestion method（HPCD）, is stud...An improved analytical method to determine the content of 52 major, minor and trace elements in marine geological samples, using a HF-HCl-HNO_3 acid system with a high-pressure closed digestion method（HPCD）, is studied by an inductively coupled plasma optical emission spectrometry（ICP-OES） and an inductively coupled plasma mass spectrometry（ICP-MS）. The operating parameters of the instruments are optimized, and the optimal analytical parameters are determined. The influences of optical spectrum and mass spectrum interferences, digestion methods and acid systems on the analytical results are investigated. The optimal spectral lines and isotopes are chosen, and internal standard element of rhodium is selected to compensate for matrix effects and analytical signals drifting. Compared with the methods of an electric heating plate digestion and a microwave digestion, a high-pressure closed digestion method is optimized with less acid, complete digestion,less damage for digestion process. The marine geological samples are dissolved completely by a HF-HCl-HNO_3 system, the relative error（RE） for the analytical results are all less than 6.0%. The method detection limits are 2–40μg/g by the ICP-OES, and 6–80 ng/g by ICP-MS. The methods are used to determine the marine sediment reference materials（GBW07309, GBW07311, GBW07313）, rock reference materials（GBW07103, GBW07104,GBW07105）, and cobalt-rich crust reference materials（GBW07337, GBW07338, GBW07339）, the obtained analytical results are in agreement with the certified values, and both of the relative standard deviation（RSD） and the relative error（RE） are less than 6.0%. The analytical method meets the requirements for determining 52 elements contents of bulk marine geological samples.展开更多
考察了消解方式、消解酸体系、升温时间和目标温度对样品消解效果的影响,提出了微波消解-电感耦合等离子体原子发射光谱法(ICP-AES)同时测定钛及钛合金中Fe、Si、Mn、Mo、B、Al、Sn、Cr、V、Zr、Mg、Nb、Pd、Ni、Ta、W、Nd、Ru、Cu等19...考察了消解方式、消解酸体系、升温时间和目标温度对样品消解效果的影响,提出了微波消解-电感耦合等离子体原子发射光谱法(ICP-AES)同时测定钛及钛合金中Fe、Si、Mn、Mo、B、Al、Sn、Cr、V、Zr、Mg、Nb、Pd、Ni、Ta、W、Nd、Ru、Cu等19种元素含量的方法。取0.1000 g钛及钛合金样品置于聚四氟乙烯消解罐中,再加入8.0 mL 33%(体积分数)盐酸溶液、3.0 mL 25%(体积分数)氢氟酸溶液、1.0 mL 50%(体积分数)硝酸溶液和0.5 mL高氯酸,将其置于微波消解仪于最高消解温度120℃下保持10 min,冷却至室温,用水将消解液定容至50 mL,采用ICP-AES测定质量分数不大于1.0%的元素,将样品溶液稀释10倍,同法测定质量分数大于1.0%的元素。结果表明,19种元素的质量浓度在一定范围内与对应的响应强度呈线性关系,检出限(3s)为0.006~0.033 mg·L^(-1)。对4种钛合金标准样品和3种钛合金实际样品进行分析,并与标准方法GB/T 4698系列的测定结果进行对比,结果显示本方法的测定值与认定值基本一致。以两种钛合金标准样品和两种钛合金实际样品为研究对象进行精密度试验,每个样品平行测定5次,测定值的相对标准偏差均小于4.0%。展开更多
基金The China Ocean Mineral Resources Research and Development Association Research Program of the State Oceanic Administration of China under contract No.DY125-13-R-07the National Natural Science Foundation of China under contract Nos 41322036 and 41230960+1 种基金the Shandong Provincial Natural Science Foundation of China under contract No.ZR2014DP009the Special Basic Research Funds for Central Public Research Institutes for The First Institute of Oceanography,State Oceanic Administration of China under contract Nos GY0213G06 and GY02-2012G35
文摘An improved analytical method to determine the content of 52 major, minor and trace elements in marine geological samples, using a HF-HCl-HNO_3 acid system with a high-pressure closed digestion method（HPCD）, is studied by an inductively coupled plasma optical emission spectrometry（ICP-OES） and an inductively coupled plasma mass spectrometry（ICP-MS）. The operating parameters of the instruments are optimized, and the optimal analytical parameters are determined. The influences of optical spectrum and mass spectrum interferences, digestion methods and acid systems on the analytical results are investigated. The optimal spectral lines and isotopes are chosen, and internal standard element of rhodium is selected to compensate for matrix effects and analytical signals drifting. Compared with the methods of an electric heating plate digestion and a microwave digestion, a high-pressure closed digestion method is optimized with less acid, complete digestion,less damage for digestion process. The marine geological samples are dissolved completely by a HF-HCl-HNO_3 system, the relative error（RE） for the analytical results are all less than 6.0%. The method detection limits are 2–40μg/g by the ICP-OES, and 6–80 ng/g by ICP-MS. The methods are used to determine the marine sediment reference materials（GBW07309, GBW07311, GBW07313）, rock reference materials（GBW07103, GBW07104,GBW07105）, and cobalt-rich crust reference materials（GBW07337, GBW07338, GBW07339）, the obtained analytical results are in agreement with the certified values, and both of the relative standard deviation（RSD） and the relative error（RE） are less than 6.0%. The analytical method meets the requirements for determining 52 elements contents of bulk marine geological samples.
文摘考察了消解方式、消解酸体系、升温时间和目标温度对样品消解效果的影响,提出了微波消解-电感耦合等离子体原子发射光谱法(ICP-AES)同时测定钛及钛合金中Fe、Si、Mn、Mo、B、Al、Sn、Cr、V、Zr、Mg、Nb、Pd、Ni、Ta、W、Nd、Ru、Cu等19种元素含量的方法。取0.1000 g钛及钛合金样品置于聚四氟乙烯消解罐中,再加入8.0 mL 33%(体积分数)盐酸溶液、3.0 mL 25%(体积分数)氢氟酸溶液、1.0 mL 50%(体积分数)硝酸溶液和0.5 mL高氯酸,将其置于微波消解仪于最高消解温度120℃下保持10 min,冷却至室温,用水将消解液定容至50 mL,采用ICP-AES测定质量分数不大于1.0%的元素,将样品溶液稀释10倍,同法测定质量分数大于1.0%的元素。结果表明,19种元素的质量浓度在一定范围内与对应的响应强度呈线性关系,检出限(3s)为0.006~0.033 mg·L^(-1)。对4种钛合金标准样品和3种钛合金实际样品进行分析,并与标准方法GB/T 4698系列的测定结果进行对比,结果显示本方法的测定值与认定值基本一致。以两种钛合金标准样品和两种钛合金实际样品为研究对象进行精密度试验,每个样品平行测定5次,测定值的相对标准偏差均小于4.0%。
