Can sulfide interfere with Copper methods?
Sulfide interference in copper measurement
Yes, but the concentration of sulfide is not documented. To treat this interference perform a digestion or follow the sulfide pretreatment steps found in phosphate Method 8048 provided. Measure 25mL of sample into a 50mL beaker. Swirling constantly, add Bromine Water catalog number 221120 drop-wise until a permanent yellow color appears. Swirling constantly, add Phenol Solution catalog number 21220 drop-wise just until the yellow color disappears.