Auckland soil geochemical baseline

Maps and quality assurance and quality control (QAQC) data of trace element concentrations in soil from the Auckland Region. Point source and interpolated maps of trace element concentration in soil samples taken over the Auckland Region are included for three depths: O-depth (0-2 cm); A-depth (2-20 cm); B-depth (50-70 cm). Trace concentrations for 65 elements were measured via ICPMS undertaken at Bureau Veritas Mineral Laboratories, Vancouver, Canada. A 0.5 g split of each sample was digested in 10 ml of 1:1:1 HCl-HNO3-deionized H2O aqua regia solution in glassware for one hour in a hot water bath. Five percent HCl was used to return each sample to a standard 10 ml volume post-heating. The entire sample set was run consecutively, in batches of 40, on a single machine to minimise time-dependant variation, using a PerkinElmer ELAN 9000 ICPMS instrument. In total 487 samples were run [336 unknown samples and 151 samples for QAQC].本数据集涵盖奥克兰地区土壤微量元素浓度的分布图及质量保证与质量控制（QAQC）数据。本次研究针对奥克兰地区采集的土壤样品，按三个深度分层（O层：0~2 cm；A层：2~20 cm；B层：50~70 cm），分别绘制了微量元素浓度的点源分布图与插值分布图。 65种元素的痕量浓度通过电感耦合等离子体质谱法（ICPMS）测定，测试工作由加拿大温哥华必维矿产实验室（Bureau Veritas Mineral Laboratories）完成。每份样品取0.5 g分样，置于玻璃容器中，加入10 mL体积比为1:1:1的HCl-HNO3-去离子水王水溶液，在热水浴中消解1小时。消解完成后，使用5%盐酸将每份样品定容至标准10 mL体积。整套样品以每批次40个样品的规模，在同一台仪器上连续上机测试，以最小化随时间产生的误差，所用仪器为PerkinElmer ELAN 9000型电感耦合等离子体质谱仪。共计完成487个样品的测试，其中336个为未知样品，151个为质量保证与质量控制样品。