This standard specifies a gravimetric method for the determination of sulfates in water. This method is applicable to all types of water, including seawater and most industrial wastewater. See 7. for information on substances that may interfere.
JIS K 0400-41-40:2000 history
2000JIS K 0400-41-40:2000 Water quality -- Determination of sulfate -- Gravimetric method using barium chloride