Economic and Environmental Geology

Table. 1.

Table. 1.

The descriptive statistics of metal (loid) contents in soil samples by ex-situ (ICP-AES) and in-situ (Portable XRF) measurements

Unit: mg kg-1 Laboratory analysis using ICP-AES (n=153) Portable XRF (PXRF) measurements in the field (n=156)
As Pb Cu Ni Zn As Pb Cu Ni Zn
Minimum 4.41 13.71 6.21 3.87 16.00 0.50 12.00 12.00 14.60 137.00
Maximum 236.70 961.67 167.70 33.70 112.83 143.00 430.00 145.00 25.00 205.00
Range 232.29 947.96 161.49 29.83 96.83 142.50 418.00 133.00 10.40 68.00
Median 66.33 160.47 53.23 11.47 43.47 22.00 60.50 34.00 20.30 163.00
Mean 74.48 196.93 56.02 11.45 43.25 27.95 74.33 38.05 20.30 164.40
SE.mean* 4.17 13.42 2.67 0.30 1.14 2.04 4.77 1.46 0.17 0.79
CI.mean** 8.24 26.51 5.27 0.60 2.26 4.04 9.41 2.89 0.33 1.57
Var.*** 2662.33 27540.86 1087.04 13.89 200.45 651.63 3542.20 333.70 4.49 98.59
Std.dev.**** 51.60 165.95 32.97 3.73 14.16 25.53 59.52 18.27 2.12 9.93
Coef.var***** 0.69 0.84 0.59 0.33 0.33 0.91 0.80 0.48 0.10 0.06

* SE.mean: the standard error of the mean; ** CI.mean: the confidence interval of the mean at the p level of 0.95; *** Var: the variance; **** Std.dev: the standard deviation; ***** Coef.var: the variation coefficient defined as the standard deviation divided by the mean

Econ. Environ. Geol. 2022;55:353-66 https://doi.org/10.9719/EEG.2022.55.4.353
© 2022 Econ. Environ. Geol.