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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,��

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2��x��ԇ��

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��⛘˜��Һ��1/6K2Cr2O7=0.2500mol/L��:�Qȡ�A(y��)��120��2h�Ļ��ʻ�(y��u)��t��12.258g��ˮ�У��1000ml��ƿ��,��ϡ��˾�,��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�@�˜��Һ((NH4)2Fe(SO4)2·6H2O=0.1mol/L):�Qȡ39.5g��၆�F�@��ˮ��,߅��߅��20ml��,��s��1000ml��ƿ��,��ˮϡ��˾�,�u��.�R��ǰ,��t��⛘˜��Һ�˶�.
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��,�ʴ_��10.00ml��t��⛘˜��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�@�˜��Һ(0.1mol/L)�ζ�,��Һ��ɫ��Sɫ��(j��ng)�{�Gɫ��t��ɫ��K�c,ӛ��၆�F�@�˜��Һ��.
6)�y��ˮ�ӵ�ͬ�r��20ml��sˮ��ͬ�Ӳ��E��հ�ԇ�,ӛ��၆�F�@�˜��Һ��.

4.Ӌ��:

COD = ( V0 - V1 ) × C × 8 × 1000/V

ʽ�� V0 ------- �ζ��հוr��၆�F�@�˜��Һ��,mg/L
V1 ------- �ζ�ˮ�ӕr��၆�F�@�˜��Һ��,mg/L
C ------- ��၆�F�@�˜��Һ�ĝ��,mol/L
V ------- ˮ�ӵ��w�e,ml

5.�y��Y(ji��)��

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

6.ӑՓ

1)�·��ă�(y��u)�c��ڲ��ʹ�Ä��ˎƷ��ṯ,��ʹ��ṯ��ɵČ��˵�Σ��͌��h(hu��n)��Ķ��Ⱦ.�y��Y(ji��)��S�`���(n��i).
2)��F(xi��n)�ĳ��ٕ��ɵζ��K�c��@,ʹ�y��Y(ji��)��_.
3)��u�tɫ��ʧ,��Ȼ��ʹ��ĵ��t��Ӵ�,�ʵζ�ǰһ��Ҫ��Ȼ��cʹ�u�tɫ��ʧ.

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