GB/T 45131-2025 Analysis of water used in boiler and cooling system—Determination of phosphate,chloride,silicate,total alkalinity,phenolphthalein alkalinity,hardness and iron—Spectrophotometric detection by discrete analysis systems

Scope

This document describes the method for determining the content of phosphate, chloride, silicate, total alkalinity, phenolphthalein alkalinity, hardness, and iron in boiler water and cooling water using a discontinuous analysis system. This document is applicable to the determination of phosphate, chloride, silicate, total alkalinity, phenolphthalein alkalinity, hardness, and iron in boiler water and cooling water. The applicable range of this method is: phosphate (calculated as PO43-): 1.00 mg/L to 50.00 mg/L; chloride (calculated as Cl-): 10.00 mg/L to 100.0 mg/L; silicate (calculated as Si): 0.10 mg/L to 6.00 mg/L; total alkalinity: 0.50 mmol/L to 8.00 mmol/L; phenolphthalein alkalinity: 0.50 mmol/L to 5.00 mmol/L; hardness (based on Ca2+ and Mg2+): 0.50 mmol/L to 1.75 mmol/L; and iron (calculated as Fe): 0.10 mg/L to 10.00 mg/L.

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