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

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

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

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߀ԭ��Ŀǰ��^��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,��\��M�õ�,��̎��Ч��á��ă�(y��u)�c,��õ��V��,��ڲ��ô˷��r,��߀ԭ��x��P��Ҫ��һ��}��

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

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

Cr3+ + 30H- = Cr(OH)3↓

2.2 ��ˇ��̈D��D��ʾ��