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1 �P�I��——��Ʒ�Ĵ��

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1.1 ��uˮ��

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1.2 ˮ�ӓu��ȡ��

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1.3 ȡ��̫��

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1.4 ��Һ��,��̶Ⱦ�

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2 �{��t��⛘˜��Һ�ĝ�Ȼ��

�ژ˜�COD��,��t��⛵ĝ��һ��0.25mol/L,��ژ�Ʒ�y��r�ļ��10.00mL��ˮȡ��20.00mL,��ˮ��COD��^�ߕr,��һ��ȡ��Ʒ��ϡጘ�Ʒ�ķ��M��ϗl��ơ��ˮ�؄e��ԭˮ��f,��oՓ��ȡ��߀��ϡ�ˮ�Ӷ��ܱ��C��ȡ��Ʒ��Ĵ��,��@�r��ԓ�m��{��t��⛘˜��Һ�ĝ�Ȼ��ṩ��ֵ��,��ˮ�ۺ͢܁��f,��ʹ��ȡ��ߵ�50.00mL��10.00mL��Ȟ�0.25mol/L��t��⛘˜��Һ�r,��^�͵�CODˮ�|��f��@�^��,��˕r��m��{��t��⛘˜��Һ�ĝ�Ȼ��ʹ��Һ��ʣ��t��m��l(f��)�F(xi��n),��t��⛝�Ƚ��͵�0.025mol/L�r,��ĵζ��K�c��^�죬ɫ׃��@��,��Ԍ�COD�^С�ĳ�ˮ�ۺ͢�,��h�Ý�Ȟ�0.05 mol/L��t��⛘˜��Һ;��ڸߝ�ȵ�ԭˮ�Ý�Ȟ�0.5mol/L��t��⛘˜��Һ��m��?sh��)��{��ʹ��Ʒ�ĵζ��w�e�c�ζ��հ׵��w�e��@��Ĳ�p��,��

3 �{��ζ�Һ��၆�F�@�˜��Һ�ĝ��

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C[(NH4)2Fe(SO4)2]=0.250×10.00/V[(NH4)2Fe(SO4)2]

��၆�F�@��Ȟ�0.1mol/L�r,��10.00mL��0.25mol/L��t��һ�c��,��ζ��၆�F�@��w�e��25.00mL;��t��⛱��Ʒ�е�߀ԭ��|��һ��r,��၆�F�@�ĵζ��w�e��12.50mL��Ĝp�ٷ��ζ��`��ĽǶȁ��,��ʹ�ζ��w�e��20��50mL��,��˽��h��၆�F�@��{��Դ��0.05mol/L(��С��0.05mol/L��հ��၆�F�@��w�e��ڵζ��ܵ��ݷe50.00mL,��ʼ�c�ͽK�c��Ҫ�x��(sh��)�ɴ�,��Ӵ��`��)��һ��0.055mol/L��,��@��ʹ�ζ��հ׵��w�e��45mL��,��ʹ��Ʒ��w�e�c�ζ��w�e�^��m��

COD��Ӌ�㹫ʽ��

CODCr=(V0-V1)×C×8×1000/V

ʽ�С�C——��၆�F�@�˜��Һ�ĝ��,��mol/L��

V——ˮ��w�e,��mL��

V0——�ζ��հוr��၆�F�@�˜��Һ��mL

V1——�ζ�ˮ�ӕr��၆�F�@�˜��Һ��,��mL

8——��(1/2)Ħ��|��,��g/mol��

(C×8×1 000)/V�ஔ��၆�F�@��O2�ĵζ��TO2/(NH4)2Fe(SO4)2��

T=C×8×1000/V

��V=20mL,��C=0.1mol/L�r,��T=(0.1×8×1000)/20=40mg/mL;

��C=0.05mol/L�r��T=(0.05×8×1000)/20=20mg/mL,��

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