关中盆地地下水无机指标数据集(2015年度)

This dataset contains information about the locations and sampling layers of 200 groundwater samples taken in the Guanzhong Basin in 2015 as well as test results of 33 inorganic geochemical components. According to a comprehensive water quality evaluation, the samples above, if classified by water quality level, include 10 blank samples, 2 class-Ⅱ samples, 57 class-Ⅲ samples, 56 class-IV samples, and 75 class-V samples. If classified by water quality type, they include 111 fresh water samples, 71 brackish water samples, and 8 saline water samples. Samples were taken in compliance with procedures. Test results were obtained in qualified laboratory tests, so the obtained data was of a reliable quality. From the margin to the center of the Guanzhong Basin, the hydrochemical types of groundwater change from HCO3-Ca to HCO3-Ca·Mg·Na and then to SO4·Cl-Na, presenting a distinct horizontal zoning character pattern. According to the water quality evaluation, the groundwater quality is poor in Guanzhong Basin at this time, with 68.9% of the groundwater unfit for drinking. Class Ⅱ and Ⅲ water is mainly distributed in some areas to the south, west, and north of the Guanzhong Basin. Class IV water is mainly distributed around the Weihe River, and in Gaoling County, Jingyang County, and Qian County. Class V water is mainly distributed throughout the counties of Dali, Pucheng, Fuping, Sanyuan and Liquan, Yanliang District and surrounding areas of Xianyang City. This dataset will provide a geochemical indicator reference for studying the cyclical evolution of groundwater in the Guanzhong Basin.

本数据集涵盖2015年于关中盆地采集的200份地下水样品的采样点位、采样层位信息，以及33项无机地球化学组分的检测结果。经综合水质评价，若按水质等级划分，上述样品包含10份空白样品、2份Ⅱ类水样品、57份Ⅲ类水样品、56份Ⅳ类水样品及75份Ⅴ类水样品；若按水质类型分类，则包括111份淡水样品、71份微咸水样品与8份咸水样品。所有样品均严格遵循规范流程采集，检测结果均出自具备合格资质的实验室，因此本数据集数据质量可靠。从关中盆地边缘至中心区域，地下水水化学类型由HCO3-Ca型逐步演变为HCO3-Ca·Mg·Na型，最终过渡至SO4·Cl-Na型，呈现出显著的水平分带特征。本次水质评价结果显示，彼时关中盆地地下水整体质量欠佳，68.9%的地下水不适宜饮用。Ⅱ类及Ⅲ类水主要分布于关中盆地南部、西部及北部的部分区域；Ⅳ类水主要分布于渭河沿岸及高陵县、泾阳县、乾县境内；Ⅴ类水主要覆盖大荔县、蒲城县、富平县、三原县、礼泉县全域，以及西安市阎良区与咸阳市周边区域。本数据集可为关中盆地地下水循环演化研究提供地球化学指标参考依据。