��΢��ⷨ�y��COD

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1.1��ԇ��

��t��⛘˜��Һ��Qȡ�A(y��)��120��º��2h�Ļ��t��12.258g��ˮ��D(zhu��n)��1L��ƿ,��ˮ��,��tC(1/6K2Cr2O7)=0.2500mol/L��

ԇ��F�`ָʾ��Qȡ1.485g��_��,��0.695g��၆�F(FeSO4·7H2O)��ˮ��,��D(zhu��n)��100mL��ƿ��,��ˮ��ݣ�

��၆�F�@�˜��Һ(0.1mol/L)��Qȡ39.5g��၆�F�@��(NH4)2Fe(SO4)2·6H2O��ˮ��,��20mL��,��s��D(zhu��n)��1 L��ƿ��ˮ��,�R��ǰ��t��Һ�˶�,��

��—��y��Һ��500mL��м��7g��y,��1��2d��ʹ��,��

COD�˜��Һ��110��º��2h��ڸ��s,�Qȡ0.2552g��ˮ�ܽⲢ��1L��ƿ��,�t��300mg/L��COD�˜��Һ,�Õr�F(xi��n)��

1.2�� ԇ򞷽��

ȡ10.00mL��COD�˜��Һ(��h(hu��n)��ˮ��)��F��ƿ�У��5.00mL��t��⛘˜��Һ,��پ��20.0mL��—��y��Һ,��p�uʹ֮��Ͼ��΢��t��(n��i)��ڵ͙n��(190W)�¼ӟ�4min,��Ҝغ��30mL��sˮ�_ϴ��܃�(n��i)��,��ȡ��F��ƿ��3��ԇ��F�`ָʾ��၆�F�@�˜��Һ�ζ��Һ�ɫ��{�Gɫ׃?y��u)�t��ɫ��K�c,��ͬ�r��ȡ10.00mL��sˮ��ԇ��հ�,��ʽӋ��ˮ��е�COD��

��COD=(V0-V1)×C×8×1 000/V

��ʽ�� V0——�ζ��հוr��ĵ��၆�F�@��Һ��w�e��mL
�� V1——��ZK(��ζ�ˮ�ӕr��ĵ��၆�F�@��Һ��w�e,��mL
�� V——��ȡˮ�ӵ��w�e,��mL��
�� C——��၆�F�@��Һ�ĝ�ȣ�mol/L

2��Y(ji��)��cӑՓ

2.1�� ԇ�l��

��L25(56)��ԇ�,��x��w�e,��y��r�g,��⹦��4��,��x��5��ˮƽ�M��ԇ򞡣��ԇ�Y(ji��)��,��y��Y(ji��)��Ӱ��@��,��Ȼ��Ξ��y��,��⹦��c��r�g,��΢��^��r�g�^�L�r,��ڜضȸߡ��^��,��װl(f��)��F��ƿ��ѻ�ƿ��ų��ĬF(xi��n)��,��ԇ�l��—��y��Һ��y�|(zh��)��Ȟ�7g/500mL��ᡢ��20mL,��⹦�ʞ�͙n(190W),��r�g��4min��

2.2 ��r�g

��ԇ�l��׃��r�y��COD�˜��Һ,��r�g��2��8min��(n��i)��ԇ�Y(ji��)��ܝM��(Ҋ�D2),��̎��^�y��ˮ�ӕr,��ͨ�^�m��L��r�g��C��ȫ��

2.3��

��COD�˜��Һ�Ĝy��,��S��ٶ�׃��,��20mL�r��ԇ�Y(ji��)��^��M��(Ҋ�D3),��

2.4 ��y��

��—��y��Һ��y��6g/500mL��r,��COD�˜��Һ�Ĝy��Y(ji��)��^��M��(Ҋ�D4)��

2.5 ��Cl-��

�ڸ��,��ߜصėl��,��Cl-�ܱ��t��c��y��(y��ng)��ɳ��Ķ�Ӱ표y��,��ԇ�Y(ji��)��,��Ʒ��Һ�м��0.2g��ṯ��Cl-��ȣ�1900mg/L�r��y��Y(ji��)��oӰ�,��

2.6�� y��ܶ�

�ڱ�ԇ�l��,��300mg/L��COD�˜��Һ�M��6��ƽ�Мy��Y(ji��)��˜�ƫ��0.54%��y��ľ��ܶ��,��

2.7 �Ә˻��

ȡ��ˮ10.00mL��벻ͬ��COD�˜��Һ,��y��ļӘ˻��ʞ�97%��107%��ƽ��100.3%(Ҋ��1),��

��1 ��Ʒ�Ә˻��ʜy��Y(ji��)��

COD��(mg/L)	COD�y��Y(ji��)��(mg/L)	��(%)
30	32	107
60	59.4	99
90	88.3	98
120	116.5	97

3 ��Ʒ��

ȡ�h(hu��n)��ˮ��10.00mL��F��ƿ��,��0.2g��ṯ��ñ�ԇ򞷽��COD�˜��Һ�ͺ�ˮ,��ˮ,��S�Uˮ�Ș�Ʒ�M��˜y��c�˜ʷ��M��ˌ��,��y��Y(ji��)��c�˜ʷ��(Ҋ��2),��

��2 ˮ��COD��Ĝy��Y(ji��)��

�� Ʒ	��y��Y(ji��)��(mg/L)	��˜�ƫ��(%)	�˜ʷ��y��Y(ji��)��(mg/L)	��˜�ƫ��(%)	�`��(%)
COD�˜��Һ	299	0.44	300	0.53	-0.3
��ˮ��1#	17.1	3.9	16.9	2.6	+1.2
��ˮ��2#	44.0	2.1	44.2	3.4	-0.5
��ˮ	13.5	3.7	13.8	3.2	-2.2
��Uˮ	569	3.6	578	4.1	-1.6
��I(y��)�U��*	94.7	1.5	94.3	1.8	+0.4
ע��y��Δ�(sh��)��n=5,��*ϡ�100��

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��2�� ꖣ��`,��\��,��.΢��ӟ�ӿ�y��h(hu��n)��ˮ��е�CODMn��J��.�h(hu��n)�� W��1992,��13(1):79-81.

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