Hydrochemical Characteristics and Controlling Factors of Typical Dolomite Karst Basin in Humid Subtropical Zone

Table 2

Analyzed items and the methods used in water samples collected in the study area.

Items	Types		Indexes for indirect calculation	Methods
	Direct measurement	Indirect calculation
	√			Automatic monitoring
pH	√			Automatic monitoring
EC	√			Automatic monitoring
K^+				Samples were manually collected and brought back to lab for ICP-OES analysis
Na^+				Samples were manually collected and brought back to lab for ICP-OES analysis
Ca^2+				When samples were manually collected, use Ca^2+ cells for titration directly on the field and brought back to lab for ICP-OES analysis
Mg^2+				Samples were manually collected and brought back to lab for ICP-OES analysis
Cl^-				Samples were manually collected and brought back to lab for ion chromatography analysis
SO4^2-				Samples were manually collected and brought back to lab for ion chromatography analysis
NO3^-				Samples were manually collected and brought back to lab for ion chromatography analysis
HCO3^-				When samples were manually collected, use alkalinity titrating cells for titration directly on the field
		√	, pH, concentration of key ions	Calculated by Phreeqc and Watspec
SIC		√	, pH, concentration of key ions	Calculated by Phreeqc and Watspec
SID		√	, pH, concentration of key ions	Calculated by Phreeqc and Watspec