GB/T 6909-2018 Translated English of Chinese Standard (GB/T 6909-2018, GBT6909-2018): Analysis of water used in boiler and cooling system -- Determination of hardness [Buy--download True-PDF in 3-second: https://play.google.com/books > Sign in > This BOOK > "3-dots" > Export > Save as "*.pdf"]https://www.chinesestandard.net, 7 בפבר׳ 2023 - 12 עמודים This Standard specifies the determination method for hardness of water used in boiler and cooling system. This Standard applies to the determination for hardness of water used in boiler and cooling system. The determination range of chrome black T method in this Standard is 0.01mmol/L~5mmol/L. When it exceeds 5mmol/L, the sampling volume can be appropriately reduced. Determine after dilution. The determination range of acid chrome blue K method is 1¦Ìmol/L~100¦Ìmol/L. The determination range of potentiometric titration is 0.25mmol/L~10mmol/L (both with Ca2+ and Mg2+ as basic units). This Standard is also applicable to the determination of the hardness of natural water, cooling water, demineralized water and boiler feed water. |
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2mL of L-cysteine 2mL of triethanolamine acid chrome blue acid standard titration added to jointly adding the indicator ammonia-ammonium chloride buffer arithmetic mean boiler and cooling borax buffer solution c(EDTA Calculate the hardness chloride buffer solution chrome black chrome blue K concentration of disodium copper and manganese cysteine disodium edetate consumed disodium edetate standard Disodium ethylenediaminetetraacetic acid disodium magnesium salt edetate standard titration EDTA disodium magnesium eliminate the interference end point Erlenmeyer flask ethylenediaminetetraacetic acid standard greater than 0.1mg/L greater than 2mg/L hydrochloric acid solution hydrochloride and triethanolamine indicator solution jointly mask L-cysteine hydrochloride solution less than 1mmol/L liter mol/L mask and eliminate masking to eliminate Method summary milliliters mL millimoles molar concentration parallel determination results pipette to measure Reagents or materials sodium hydroxide solution solution and 2mL solution of disodium solution or hydrochloric solution to titrate standard titration solution Test steps titration solution consumed triethanolamine solution water sample reaches