I had prepared 50ml of 20,25,30,35 and 40 ppm of eriochrome black T and add 25mg of copper sulphide as photocatalyst with stirring under dark for an hour then under light for 2hours the resulted data were 99.7,99,57, 43.25 and 37.22%. Iwanna ask why this sharp decrease occurred?
Mohammed Althamthami
The most likely reason is due to the small amount of the solution (50 ml) and the high amount of eriochrome black (20,25,30,35, and 40 ppm). Try adding a small amount of eriochrome black (1 to 10 ppm).
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