Soil Cr
Description
A total of 368 topsoil samples (0–20 cm) were collected using a grid-sampling design in Shazi Town (193 km²), Guangxi Zhuang Autonomous Region, Southwest China.
Files
Steps to reproduce
In ArcGIS 10.8, a 500-m buffer zone was established around Shazi Town, within which two nested 1 km×1 km grids were used to determine sampling point locations. Field investigations were conducted from July to August 2020 based on the grid coordinates. If a sampling point was located in a water body, road, building, or other inaccessible areas, it was relocated within a 100-m radius; points that could not be adjusted were excluded. The locations of the sampling sites were recorded using a Beidou global positioning system (GPS) receiver. At each sampling point, three soil subsamples were collected from a depth of 0–20 cm within a 1-m radius and thoroughly mixed to form a composite sample. Approximately 1.0 kg of soil was obtained from each composite sample after removing stones, plant residues, and other debris.After air-drying at room, each soil sample was ground and passed through a 2-mm sieve, then divided into two parts: one for Cr concentration determination and the other for spectral data measurement. Cr concentrations were analyzed using inductively coupled plasma atomic emission spectrometry (ICP-AES, Thermo iCAP 7400) following the digestion of 0.5 g soil samples with 10 mL hot nitric acid (HNO₃, 65%, analytical grade) in a microwave digestion system (CEM MARS 6). The recovery rate of Cr in standard reference materials (GBW07405) ranged from 95% to 105%, ensuring the accuracy of the analytical results.
Institutions
- Shaoyang University