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��y��ᘌ��r,��Y(ji��)��ҏS��Hˮ�|(zh��)��y(t��ng)COD�y��M��˸��M,��˷��˂��y(t��ng)�ļ��0.4g��ṯ��x�ӵĸɔ_�Є��ṯ��h(hu��n)��wΣ��^��r��

1.�y��ԭ��

��øߝ�ȵ��y��ˮ��е��x��M�еζ��ڱ��x�Ӳ��Ȼ��y��ܽ��С��t��y��ԭ��,��ɵĴu�tɫ��t��y��ָʾ�ζ��K�c,��Ȼ��ڏ��Һ�У�һ��t��ˮ��߀ԭ��|(zh��),��^��t��ԇ��F�`��ָʾ��,��၆�F�@��Һ�صΡ��(j��)��ˮ��߀ԭ��|(zh��)��,��

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��2.1 �x��

��1) ��b�ã��250mlĥ��F��ƿ��ȫ��b��

��2) �ӟ��b�ã�׃��늠t

��3) 50ml��ʽ�ζ��

��2.2 ԇ��

��1)��t��⛘�(bi��o)��(zh��n)��Һ��1/6K2Cr2O7=0.2500mol/L��:�Qȡ�A(y��)��120��2h�Ļ��(zh��n)��(y��u)��t��12.258g��ˮ��,��1000ml��ƿ�У�ϡ��(bi��o)��,��u��,��

��2)ԇ��F�`ָʾҺ��Qȡ1.485g��_��(C12H8N2·H2O,1,10—phenanthnoline),0.695g��၆�F(FeSO4·7H2O)��ˮ��,ϡ��100ml,�A��ɫƿ��(n��i).

��3)��၆�F�@��(bi��o)��(zh��n)��Һ((NH4)2Fe(SO4)2·6H2O=0.1mol/L):�Qȡ39.5g��၆�F�@��ˮ��,߅��߅��20ml��,��s��1000ml��ƿ��,��ˮϡ��(bi��o)��,�u��.�R��ǰ,��t��⛘�(bi��o)��(zh��n)��Һ��(bi��o)��.

��4)��y��Һ(100g/L):�Qȡ100g��y(��)��sˮ��ϡ��1000ml.�A��ɫƿ��

��5)��--��y��Һ:��500ml��м��5g��y,��1-2��,��r�u��ʹ��ܽ⡣

��6)�Ȼ��c��Һ:�Qȡ1g��1000mlˮ��.

��3.�y��E

��1)ȡ20.00ml��Ͼ��ˮ��(��m��ˮ��ϡ��20.00ml)��250mlĥ�ڵĻ��F��ƿ��,��(zh��n)�_��10.00ml��t��⛘�(bi��o)��(zh��n)��Һ

��2)��y��Һ��ˮ��M�еζ��F(xi��n)�u�tɫ��.

��3)�S��딵(sh��)��С��ˮ��,�B��ĥ�ڻ��,��Ͽ��ؼ��30ml��--��y��Һ,�p�u�F��ƿʹ֮��,�ӟ��2h(��_ʼ��v�rӛ�r)

��4)��s��,��90mlˮ�_ϴ��ܱ�,ȡ��F��ƿ.��Һ�ٶ��s��,��Ȼ�l(f��)�F(xi��n)�дu�tɫ��t��딵(sh��)��Ȼ��c��Һ(1g/L)ֱ��u�tɫ��ʧ.

��5)��ˮ��м�3��ԇ��F�`ָʾҺ,��၆�F�@��(bi��o)��(zh��n)��Һ(0.1mol/L)�ζ�,��Һ��ɫ��Sɫ��(j��ng)�{�Gɫ��t��ɫ��K�c,ӛ��၆�F�@��(bi��o)��(zh��n)��Һ��.

��6)�y��ˮ�ӵ�ͬ�r��20ml��sˮ��ͬ�Ӳ��E��հ�ԇ�,ӛ��၆�F�@��(bi��o)��(zh��n)��Һ��.

��4.Ӌ��:

��COD = ( V0 - V1 ) × C × 8 × 1000/V

��ʽ�� V0 ------- �ζ��հוr��၆�F�@��(bi��o)��(zh��n)��Һ��,mg/L

��V1 ------- �ζ�ˮ�ӕr��၆�F�@��(bi��o)��(zh��n)��Һ��,mg/L

��C------- ��၆�F�@��(bi��o)��(zh��n)��Һ�ĝ��,mol/L

��V------- ˮ�ӵ��w�e,ml

��5.�y��Y(ji��)��

��(j��ng)ލ̎��ĝ�Ȟ�208mg/L�Ę�(bi��o)��(��Ȼ��cʹ��ˮ��x�ӵĺ��քe��50,��200,��1000,��4000mg/L)��Y(ji��)��@ʾ,��y��(bi��o)��(zh��n)ƫ��0.7%-1.8%,��`��-0.2%-0.9%.ԓ��c��(bi��o)��(zh��n)��Y(ji��)��Ҋ��.

��·��c��(bi��o)��(zh��n)��I(y��)�Uˮ��^

�Ŀ	��(bi��o)��(zh��n)�� �� (mg/L)	�·�� �� (mg/L)	��`�� �� (%)
ӡȾ�Uˮ	787	771	-2.0
ϴë�Uˮ	2.19×10³	2.23×10³	1.8
ơ�ƏUˮ	639	649	1.6
��ʏS�Uˮ	270	277	2.6
�켈�Uˮ	480	471	-1.9