抄録
The application of electrophotometer was studied for the determination of SO4" in salt, sea water, brine and bittern. The results are summarized as follow;
1) The penetration optical intensity of BaSO4 suspension was affected by the aging time affter addition of reagent, when the suspension was made by adding powdered BaCl2. The intensity will become stable in two hours. The most accurate estimation may be got in this method by measuring the intensity at immediate or at two hours after the addition of reagent. When the suspension was maee by adding BaCl2 solution, the the optical intensity did not vary by aging and in this method the measarment will be done after 5 minutes.
2) Fo the determination, of SO4" in salt; sea water, brine arnd bittern the estimation curves, made with corresponding samples, must be used and the errors in this method may be less than 4%.
