GB/T 6913-2023 Translated English of Chinese Standard (GB/T 6913-2023, GBT6913-2023): Analysis of water used in boiler and cooling system -- Determination of phosphate
https://www.chinesestandard.net, 9 oct. 2023 - 19 pages
This document describes methods for the determination of orthophosphate, total inorganic phosphate, and total phosphate content in water used in boiler and cooling system: ammonium molybdate spectrophotometric method and continuous flow-ammonium molybdate spectrophotometric method. This document applies to the determination of orthophosphate, total inorganic phosphate, and total phosphate content in water used in boiler and cooling system. The measurement range of the ammonium molybdate spectrophotometric method is 0.05 mg/L ~ 50 mg/L (based on PO43-); the measurement range of the continuous flow-ammonium molybdate spectrophotometric method is 0.1 mg/L ~ 50 mg/L (based on PO43-).
50 mL volumetric 500 mg/L based according to Formula adjust the pH Allowable difference mg/L ammonium molybdate solution ammonium molybdate spectrophotometric antimony arithmetic mean ascorbic acid solution based on PO43 cause interference cm absorption cell Continuous flow analyzer determination of orthophosphate differences for determination document Erlenmeyer flask Express the calculation GB/T hydrolysis liter mg/L mass concentration less measure the absorbance milligrams per liter milliliters mL of ascorbic mL volumetric flask molybdate spectrophotometric method nitric acid parallel measurement results perchloric acid Peristaltic pump Phosphate standard solution Phosphate standard stock phosphorus Pipette Pipette 5.00 mL polyphosphate potassium persulfate solution reagent package Reagents or materials results shall meet room temperature sample transferred shake Silicate Sodium dodecyl sulfate sodium hydroxide solution sodium pyrophosphate standard solution and 1.0 spectrophotometer to measure standard stock solution sulfuric acid solution terms of mass Tianjin total inorganic phosphate total phosphate based water sample water to dilute wavelength of 710