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0 ��

COD(Chemical oxygen Demand)��ˮ�|(zh��)�O(ji��n)�y�бز��ٵ��Ŀ,��京�xָ��һ��l��Ï�(qi��ng)��̎��ˮ�ӕr��,��mg/L��ʾ��W(xu��)��ӳ��ˮ��߀ԭ��|(zh��)��Ⱦ�ĳ̶�,��ڙz�y��^��,��ˮ��Cl-�O�ױ��Cl-ʹ�Üy��Y(ji��)��ƫ��,��ȵ�COD�Uˮ�Ĝy��ǬF(xi��n)��R��һ��y�},��ڌ��H�O(ji��n)�y�аl(f��)�F(xi��n)��ܶ�N�Uˮ�绯��Uˮ,��ζ��Uˮ,��a(ch��n)Ʒ�ӹ��Uˮ��Cl-��ܸߣ��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��Ҫ��ṯ��΄��,��Ӱ��Ҫ��F(xi��n)��c��

1.1 Cl-��(d��o)�y��Y(ji��)��ƫ�ߣ��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�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�rЧ��@��(d��ng)Cl-��Ⱥܸߕr�y��Y(ji��)��߀��ƫ��,��`��S��Cl-��Ӷ��,��HgSO4��Є��ҏUҺ�еĹ��}��y̎��,��ҕ��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��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��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��ȱ�c��AgCl��r��ͨ�^��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CODֵ,��

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

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

2.5 �ܷ��ⷨ

��ԭ��]��y��COD��(d��ng)ˮ�е�Cl-��Cl2��_(d��)��Һƽ��r,��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;��ܶȡ��־��(qi��ng)[4]�Ȍ��͌��Hˮ�ӵĜy��Y(ji��)��,��ܷ��ⷨ��ȏUˮ��COD��(zh��n)�_��^��,��COD��100mg/L��1000mg/L��x�ӝ��С��10000mg/L�r,��ԓ��`��≤4.2%,��ܷ��ĕr�̣��ԓ��һ��Σ�U��,��һ��Ҫ�_��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��CODֵ,��Ǒ�(y��ng)��ԓ��cK2Cr2O7��Ĝy��ֵ��ͬ,��һ��ֵK��ֻ��֪��@��ֵ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��H��(y��ng)�Õr��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�`��ַ��ĺϷ��(qu��n)��,��Ո��߳֙�(qu��n)��C��c��W(w��ng)(li��n)ϵ��҂��r��,��h��,��x�x��