Urban water supply detection parameter detection

Standard Test Method for Drinking Water: Inorganic Nonmetallic Index 1 Sulfate 1.1 Barium Sulfate Turbidimetric Method

1.1.1 Scope: This standard specifies the use of Barium Sulfate Turbidimetric Method to determine sulfate in drinking water and its source water. This method is applicable to the determination of soluble sulfates in drinking water and its source water. The minimum detection mass of this method is 0.25mg. If 50 mL of water sample is taken for measurement, the minimum detection mass concentration is 5.0 mg/L. This method is applicable to the determination of water samples with sulfate content below 40 mg/L. The stirring speed, time, temperature, and method of adding reagents can all affect the measurement results of turbidimetry, so strict control of operating conditions is required. 1.1.2 Principle: Sulfate and barium ions in water generate barium sulfate precipitation, forming turbidity. The degree of turbidity is proportional to the sulfate content in the water sample

1.1.3 Reagent 1.1.3.1 Sulfate Standard Solution [p (SOF)=1 mg/mL]: Weigh 1.478 6 g anhydrous sodium sulfate (Na, SO,) or 1.814 1 g anhydrous potassium sulfate (K, SOx), dissolve in pure water, and dilute to 1000 mL

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