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�F��w��(sh��)�H��၆�F��İl(f��)չ,��t�Uˮ��Ͷ�ӏU�F�ۻ��၆�F�r(sh��)��Cr6+ �ɱ�߀ԭ��Cr3+,��ټӟ�,��ӉA��ͨ�^�՚┇��,��ɞ��F��w�ĽM�ɲ��,��Cr3+�D(zhu��n)��Ƽ⾧ʯ�Y(ji��)��(g��u)��F��w��w��F��w��ָ��F�x��,��x�Ӽ��x��M�ɵ��,��w��(y��ng)�飺

Cr2O72- + 6Fe2+ + 14H+ = 2Cr3+ + 6Fe3+ + 7H20

Fe2+ + Fe3+ + Cr3+ + O2 = Fe3+[Fe2+ Crx3+ Fe2+1-x]O4

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߀ԭ��Ŀǰ��(y��ng)��^��V��ĺ��t�Uˮ̎��,�,��ԭ��ԗl��Uˮ�м��߀ԭ��Cr6+߀ԭ��Cr3+,��Ȼ��ټ��ʯ�һ��c,��ʹ��ډA�ԗl��ɚ��t��Ķ�ȥ��t�x�ӡ,��߀ԭ��У�SO2,��FeSO4 ��Na2SO3,��NaHSO3,��Fe�ȡ�߀ԭ��һ��Ͷ�YС,��\(y��n)��M(f��i)�õ�,��̎��Ч��á��ă�(y��u)�c(di��n),��õ��V��(y��ng)��,��ڲ��ô˷��r(sh��),��߀ԭ��x��P(gu��n)��Ҫ��һ��(g��)��},��

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2.1 ��߀ԭ��O(sh��)�了��,��Ч��^��,��̎��r(ji��)�t��_(d��)��0.l mg/L ��к��w,��ˆT��Ӱ�,��̎��ͨ�L(f��ng)�]�䣬��⌦�O(sh��)�丯�g��^��,��ֱ�ӻ��t��,��еĶ��̎��t(VI)�Uˮ��YԴ,��ԏU�ΏU,��(ji��)�s��̎��ɱ��Ҳͬ�Ӵ��ϵĆ��},��䷴��(y��ng)ԭ��飺

3SO2 + Cr2O72- + 2H+ = Cr3+ + 3SO42- + H20

Cr3+ + 30H- = Cr(OH)3↓

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