Table 3 Main water chemical index analysis test items and methods.

Analytical Test Items	Methods of analysis	Standard Methods Code
Fe	Flame atomic absorption spectrophotometry	APHA Standard Method 3111 B
Li	Flame atomic absorption spectrophotometry	APHA Standard Method 3111 B
Sr	Flame atomic absorption spectrophotometry	APHA Standard Method 3111 B
H₄SiO₄	Ammonium molybdate spectrophotometric	APHA Standard Method 4500-Si B
As、Cd、Cr、Cu、Mn、Ni、Pb、Se、Zn	Plasma emission spectroscopy	APHA Standard Method 3120 B
Br⁻	Ion chromatography	APHA Standard Method 4110 B
F⁻	Ion chromatography	APHA Standard Method 4110 B
HCO₃⁻	Acid-base titration	APHA Standard Method 2320 B
pH	Multi-Parameter Measuring Instrument	APHA Standard Method 4500-H⁺
Eh	Multi-Parameter Measuring Instrument	APHA Standard Method 2580 B
Temperature	Thermometer	APHA Standard Method 2550 B

Note: The instruments used for analytical testing are the same as those listed in Table 2. Both pH and Eh measurements were conducted with automatic temperature compensation. The reported Eh values have been calibrated against the Standard Hydrogen Electrode (SHE), thus reflecting the true redox potential (in mv) of the hot spring water samples.

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