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4H2CrO4+6NaHSO3+3H2SO4=2Cr2(SO4)3+3Na2SO4+10H2O

2H2CrO4+3Na2SO3+3H2SO4= Cr2(SO4)3+3Na2SO4+5H2O

߀ԭ��NaOH�к��pH=7��8,��ʹCr3+��Cr(OH)3��

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�� Uˮ��r�t��һ��100��1000mg/L;

�� UˮpH��2.5��3

�� ߀ԭ��Փ��(��)��c��r�t=4��1

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Ͷ�ϱȲ��(y��ng)�^�󣬷�t��Mˎ��Ҳ��[Cr2(OH)2SO3]2-��;

�� ߀ԭ��(y��ng)�r�g�s��30min;

�� t��pH��7��8,��턩��ʯ��,��̼��c��c��ɸ��(j��)��H��r�x��,��

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��၆�F߀ԭ��̎��t�Uˮ��һ�N��^�ϵ�̎��ˎ��Դ��ף��ʹ��F��ϴ�UҺ��၆�F�r,��ɱ��^�ͣ��tЧ��Ҳ�ܺ�,��၆�F��Ҫ�ǁ��F�x��߀ԭ��,��ԗl��(pH=2��3)��߀ԭ��(y��ng)�飺

H2Cr2O7+6FeSO4+6H2SO4=Cr2(SO4)3+3Fe 2(SO4)3+7H2O

��၆�F߀ԭ��r�t,��K�Uˮ��ͬ�r��Cr3+��Fe3+,��кͳ��rCr3+��Fe3+һ��õ��t�c�F��Ļ��,��a(ch��n)��,��қ]�л��Ճrֵ��@�Ǳ��ȱ�c,��Ҫ��ˇ��(sh��)�飺

�� Uˮ��r�t��Ȟ�50��100mg/L;

�� ߀ԭ�r�Uˮ��pH=1��3;

�� ߀ԭ��һ��Cr6+�� FeSO4·7H2O=1��25��30

�� (y��ng)�r�g��С��30min

�� кͳ��pH��7��9

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�� ၆�FͶ��FeSO4·7H2O��CrO3=16��1;

�� NaOH��pH=8��9;

�� ӟ�ضȿ��60��80��֮��(n��i),��˳��^80��;

�� s�՚��ؚ⣬�ȳ��?j��n)��?/p>

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ˮ��N2H4·H2O��Ի�΢�A�ԗl��,��Ѹ�ٵ�߀ԭ��r�t��ɚ��t��

4CrO3+3N2H4=4Cr(OH)3+3N2

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2,��늽ⷨ

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늽�߀ԭ̎��t�Uˮ�Ĺ�ˇ��(sh��)��

�� t�UˮCr6+��Ȟ�50��200mg/L;

�� UˮpH≤6.5��һ�㺬�t25��150mg/L֮�g�ďUˮ,��pHֵ��3.5��6.5,��ʲ��{(di��o)��(ji��)pHֵ;

�� ض�Ӱ푲��һ��̎��ˮ�ؼs��1��2��,��

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