��ˮCOD�y��ĸɔ_��

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COD(Chemical oxygen Demand)��ˮ�|(zh��)�O(ji��n)�y�бز��ٵ��(xi��ng)Ŀ��京�xָ��һ��l��Ï�(qi��ng)��̎��ˮ�ӕr(sh��)��,��mg/L��ʾ,��W(xu��)��ӳ��ˮ��߀ԭ��|(zh��)��Ⱦ�ĳ̶�,��ڙz�y��^��У�ˮ��Cl-�O�ױ��,��Cl-ʹ�Üy��Y(ji��)��ƫ��,��ȵ�COD�Uˮ�Ĝy��ǬF(xi��n)��R��һ��(g��)�y�}��ڌ�(sh��)�H�O(ji��n)�y�аl(f��)�F(xi��n),��ܶ�N�Uˮ�绯��Uˮ,��ζ��Uˮ��a(ch��n)Ʒ�ӹ��Uˮ��Cl-��ܸ�,��COD�y��Ҫ��Cl-�M(j��n)��κ��M(j��n)�Мy��,��V��h(hu��n)��O(ji��n)�y��Cl-��COD�y��ɔ_��˴��Cl-Ӱ푷�ʽ�ͬF(xi��n)�е�Cl-�ɔ_��ɷ��M(j��n)��U��,��

1 Cl-��COD�y��ĸɔ_

��GB11914-89��ˮ�|(zh��)��W(xu��)��Ĝy��-��t��⛷��,��_ָ��ˮ��Cl-��^�ߕr(sh��)��Ҫ��ṯ��΄��Σ��Ӱ��Ҫ��F(xi��n)��c(di��n)��

1.1 Cl-��,��(d��o)�y��Y(ji��)��ƫ��,��w��(y��ng)��ʽ�飺

6Cl-+Cr2O72-+14H+→3Cl2+2Cr3-+7H2O

1.2 ��(y��ng)�wϵ�м��y�}��߻��Cl-�c�y��(y��ng)��AgCl��ʹ�߻��ж�,��Ӱ표y��Y(ji��)��,��

2 COD�y��Cl-�ɔ_�ķ��(y��ng)��

��ˮ��M(j��n)��ϡ��Ǻ��Ч�ķ��֮һ��(bi��o)��Ҳ�ᵽ��Cl-��^1000mg/Lˮ��M(j��n)��ϡ�,��ڸ��ȵ�COD��ˮ��ϡጱ��(sh��)�^�ߕ�(hu��)Ӱ표y��ȡ�Ŀǰ,��Cl-�ĸɔ_��ӿ�F(xi��n),��Ҫ�й��}��y�}��,��(bi��o)��(zh��n)��У��,��Ț�У��]��ⷨ,��͝��,��KI-KMnO4��G��Մ��ȷ��,��

2.1 ��}��

��}��Ҳ��ṯ�j(lu��)�Ϸ�,��Ǉ��(bi��o)��Cl-�ķ��HgSO4��Cl-�ڱ΄�,��HgSO4�cCl-��|(zh��)��10��1��,��˷��Cl-�|(zh��)��С��200mg/L�r(sh��)Ч��@��(d��ng)Cl-��Ⱥܸߕr(sh��)�y��Y(ji��)��߀��ƫ��,��`��S��Cl-��Ӷ��,��HgSO4��Є��,��ҏUҺ�еĹ��}��y̎��ҕ�(hu��)��h(hu��n)��a(ch��n)��Ⱦ,��ʹ�V��W(xu��)�ߌ��o��o��Ⱦ�y��о�,��

2.2 �y�}��

�y�}��AgNO3��AgCl��ȥ��Cl-Ӱ푵ķ��m��Cl-�|(zh��)��ȳ��^10000mg/L��ˮ��,��ԓ��ͨ��ЃɷN��ʽ��һ�N��A(y��)̎��r(sh��)��AgNO3,��ȡ��Һ�y��CODֵ��˷��ҪAgNO3��m��(d��ng),��ʹCl-��ȫ��Ҳ��^��,��P[1]��ژ�(bi��o)��(zh��n)��Ļ��A(ch��)��y�к�Cl-��˷��(y��ng)�wϵ��,��ұ��˹��}��Ⱦ,��(sh��)�(y��n)�Y(ji��)��˝M�⡣��һ�N��AgNO3��KCr(SO4)2��Cl-��ڱ΄�,��KCr(SO4)2��^��Cl-�l(f��)��(y��ng),��

�y�}��ʹ��F�ص��y�}��ʹ�y��ɱ��,��ˌ��y�Ļ��Ǻ��б�Ҫ�Ե�,��һ��(g��)ȱ�c(di��n)��AgCl��r(sh��)��(hu��)ͨ�^��ʹˮ��ЙC(j��)��pʧһ��֣�ʹ�y��Y(ji��)��ƫ��,��

2.3 ��(bi��o)��(zh��n)��У��

��(bi��o)��(zh��n)��У��Ĳ��E��Ʋ�ͬCl-��ȵ��Ȼ��c��(bi��o)��(zh��n)��y��CODֵ,��L��COD-Cl-��(bi��o)��(zh��n)��Ȼ��ȡ�ɷ��ͬˮ��,��һ�݌�Cl-��M(j��n)��ڱΜy��CODֵ,��ӛ��COD��һ�ݜy��x�Ӻ��,��ژ�(bi��o)��(zh��n)��ϲ��(y��ng)��CODֵ,��ӛ��CODCl-��tCOD��cCODCl-��ֵ��ԓ��Ʒ��挍(sh��)CODֵ,��

��(bi��o)��(zh��n)��У��ʹ�ù��}��y�},��Эh(hu��n)��Ժ͹�(ji��)�s�ԣ��ǌ�(sh��)�(y��n)��x�ķ��,��ϼ[2]��ͨ�^��(sh��)�(y��n)�C��@�N��ȫ��ķ��,�c��ՓCl-��ȫ��r(sh��)��ĵ��ஔ(d��ng),��Cl-��99%��ϣ�COD�Č�(sh��)�yֵ�c��(sh��)�Hֵ��õ�һ��,��ڸ��(sh��)�(y��n)�Ҳ��õķ��,��l��Ĳ�ͬ��ʹ��Cl-��̶Ȳ�ͬ��˲�ͬ��L�ƵĘ�(bi��o)��(zh��n)��M��ͬ,��ʹ��(sh��)�(y��n)�@�úܷ��,��2.4 �Ț�У��

��r(sh��)��һ��(g��)��b�ã��ɵ�Cl2��(d��o)��NaOH��Һ��,��ʹ��Na2S2O3��(bi��o)��(zh��n)��Һ�ζ�,��ĵ�Na2S2O3��Q��Cl-��У��ֵ,��(sh��)�H�UˮCODֵ��COD��^ֵ�cCl-��У��ֵ�Ĳ�ֵ,��ԓ��m��x�Ӻ��С��20000mg/L��COD��30mg/L�ĸ��ȏUˮ�Ĝy��,��о��Y(ji��)��,��10��(g��)��(sh��)�(y��n)�Ҍ�COD75.5mg/L��208mg/L��x�ӝ�Ȟ�3000mg/L��16000mg/��Ă�(g��)�y(t��ng)һ��Ʒ�M(j��n)�Мy��,��(sh��)�(y��n)�҃�(n��i)��(bi��o)��(zh��n)ƫ��2.8%��3.6%֮�g;��(sh��)�(y��n)��g��(bi��o)��(zh��n)ƫ��3.2%��7.8%֮�g[3],��ԓ��Ҫ��(sh��)�(y��n)�r(sh��)�ǳ��м�(x��)��t��(hu��)��`��,��

2.5 �ܷ��ⷨ

��ԭ��]��y��COD,��(d��ng)ˮ�е�Cl-��Cl2��_(d��)��Һƽ��r(sh��)��Cl-�㲻��ٱ��,��ʹ��m��(d��ng)?sh��)��ڱ΄�,��t��Ԝy��Ʒ��CODֵ��c��(bi��o)��(zh��n)��,��ԓ��ĽY(ji��)��и��ߵĜ�(zh��n)�_�Ⱥ;��ܶ�,��־��(qi��ng)[4]�Ȍ��͌�(sh��)�Hˮ�ӵĜy��Y(ji��)��ܷ��ⷨ��ȏUˮ��COD��(zh��n)�_��^��,��COD��100mg/L��1000mg/L,��x�ӝ��С��10000mg/L�r(sh��)��ԓ��`��≤4.2%,��ܷ��ĕr(sh��)��,��ԓ��һ��Σ�U(xi��n)��,��һ��Ҫ�_��(sh��)�(y��n)�İ�ȫ,��

2.6 KI-KMnO4��

�ډA�ԗl��£��KMnO4��Uˮ�е��|(zh��),��ʣ��KMnO4��KI߀ԭ,��Na2S2O3��(bi��o)��(zh��n)��Һ�ζ�,��Na2S2O3��ĵ��Q��Ķ��õ�һ��(g��)CODֵ,��Ǒ�(y��ng)��ԓ��cK2Cr2O7��Ĝy��ֵ��ͬ,��һ��(g��)��ֵK��ֻ��֪��@��(g��)��ֵK��Ɍ��KI-KMnO4��y�õ�CODֵ�M(j��n)�ГQ�㼴��,��ԓ��m��Cl-��ڎ��f��ʮ�f��ÿ��ďUˮ,��Ҫ�y��Kֵ��˺ܷ��,��

2.7 �G��Մ��ȷ�

ˮ��е�Cl-��Һ�w��HCl��w��ʽጷų��,��G��Մ��ճ�ȥ��Ȼ��y��CODֵ,��ԓ��Ĝ�(zh��n)�_�Ⱥ;��_��c��(bi��o)��(zh��n)��ȟo�@��,��ⷽʽ��ͬ��΢��,��

3 �Y(ji��)Փ

�C�Ͽ�֪,��Cl-��ˮCODӰ푵ķ��Էփ��:ˎ��μ��͜y��V��W(xu��)��ڷ��ĸ��M(j��n)��˺ܶ๤��,��o��o��Ⱦ,��ݜ�(zh��n)�_�ķ��l(f��)չ��N��ڌ�(sh��)�H��(y��ng)�Õr(sh��)��һ��m�÷��;��,��߀�д��M(j��n)һ��ĸ��M(j��n)��,��ӏ�(qi��ng)��N��֮�g�Ľ��B͸��̽��µ��Cl-�ɔ_�ķ��һ��x��

����D(zhu��n)�d��ǳ��ڂ��f��Ϣ֮Ŀ��,��Ё�Դ��(bi��o)ע�e(cu��)�`��ַ��ĺϷ��(qu��n)��,��Ո��߳֙�(qu��n)��C��c��W(w��ng)(li��n)ϵ��҂��r(sh��)��,��h��,��x�x��