T/CAIA SH025-2025 Active Group standards

T/CAIA SH025-2025 Determination of Total Phosphorus in Surface Water by Automatic Digestion-spectrophotometry

Publish Date: 2025-07-01 Implement Date: 2025-08-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/CAIA SH025-2025

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: \nChemical testing of water

Publish Date: 2025-07-01

Implement Date: 2025-08-01

Scope

Scope: This document describes the method for determining the total phosphorus content using an automatic dissolution photometry method. This document is applicable to the determination of total phosphorus content in surface water. The method has a detection limit of 0.01 mg/L (calculated as P) and a measurement range of 0.04 mg/L to 1.20 mg/L. Other types of water samples can refer to this document for implementation. Main technical content: Under high-temperature and high-pressure conditions, potassium persulfate converts phosphorus-containing compounds into orthophosphate. In an acidic medium, orthophosphate reacts with ammonium molybdate to form phosphomolybdenic acid in the presence of antimony salts, which is reduced by ascorbic acid to form a blue complex. The total phosphorus content is determined by photometry. A calibration curve is established based on the absorbance value after subtracting the blank and its corresponding total phosphorus content.

Development Information

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