��ˮ��COD�O(ji��n)�y��l��Ŀ��

��r�g��2011-09-08 13:48 ��Դ�� : ��x��2097

��ˮ̎��^��,��ˮ�|(zh��)COD�ıO(ji��n)�y��ȴ��¿ɷ֞�4��^�ߝ�ȵ�ԭˮ,��COD�s��1000mg/L;��̎��еȝ�ȳ�ˮ��COD�s��500mg/L;��̎��ĵ͝�ȳ�ˮ,��COD�s��150mg/L;��̎��_�˵ĳ�ˮ,��COD�s��30mg/L��ˢۺ͢ܞ��ˮ�|(zh��)��,��ٺ͢��ж��д��y�Է�ɢ�đҸ��,��ڌ��@�ӵ��ˮ�M�бO(ji��n)�y��r��횲�ȡ��Ŀ��Ʒ�ʽ,��

1 �P�I��——��Ʒ�Ĵ��

��ˮ̎��б��O(ji��n)�y��ˮ�ӘO��,��Ҫ��õ��ʴ_��COD�O(ji��n)�y�Y(ji��)��P�I��ȡ��Ҫ�д��,��Ҫ�_��@һҪ��,��Ҫע��c��

1.1 ��uˮ��

��ԭˮ�ٺ�̎��ˮ�ڵĜy��,��ȡ��ǰ��ƿ��o��u,��ʹ��ˮ��е��K��Ҹ��M��ɢ�_,��Ա��ȡ��^��,��д��Ե�ˮ�ӡ��̎��׃��^��ĳ�ˮ�ۺ͢�,��ҲҪ��ˮ�ӓu��ȡ�Ӝy��,��ˮˮ��M��COD�y��r�l(f��)�F(xi��n)��u��ˮ�ӵĜy��Y(ji��)��׳��F(xi��n)�^��ƫ��,��f��ȡ��^�д��,��

1.2 ˮ�ӓu��ȡ��

��ˮ�к��д��đҸ��,��u��󲻿��ȡ�ӣ��Ҹ��ܿ��³�,��ȡ�ӵ��Һ��ژ�ƿ��,��С��²�ͬλ��ȡ�õ�ˮ�ӝ��,��؄e�ǑҸ��ĽM�ɕ��һ��,��ܴ��ԓ��ˮ��H��r��y�õĽY(ji��)��Ҳ�]�д��,��u��ȡ��,��mȻ��u�a(ch��n)��˚��(��ȡˮ�ӵ��^��в��֚��ݕ��ɢ)��ȡ�ӵ��w�e��ݵĴ��ڶ��ڽ^��ϴ��һ�c�`��,��@�c�^��ϵĜp��ķ��`��c��Ʒ��ԵĲ��ɵ��`��ȿ��Ժ��Բ�Ӌ,��

�u�Ӻ��ò�ͬ�r�g��ˮ��c�u�Ӻ��ȡ�ӷ��Ĝy��Ռ��l(f��)�F(xi��n)��ǰ�ߜy��ĽY(ji��)��c��Hˮ�|(zh��)��r��^��ƫ��,��

1.3 ȡ��̫��

ȡ��̫��,��ˮ�؄e��ԭˮ��ĳ�N��¸ߺ��w��ֲ��ܿ��ȡ��ϣ��@�Ӝy��COD�Y(ji��)��c��H��ˮ��ܴ�,��ͬһ��Ʒ��2.00,��10.00��20.00,��50.00mLȡ��ͬ�ȗl��y��,��l(f��)�F(xi��n)ȡ2.00mLԭˮ��K��ˮ��y��COD�Y(ji��)��c��Hˮ�|(zh��)��y(t��ng)Ӌ��(sh��)��(j��)��Ҏ(gu��)��Ҳ�ܲ�;ȡ10.00,��20.00mLˮ�Ӝy��ĽY(ji��)��Ҏ(gu��)��Դ��и��;ȡ50.00mLˮ�Ӝy��COD�Y(ji��)��Ҏ(gu��)��Էǳ��,��

��Ԍ��COD��^��ԭˮ��һζ��Üp��ȡ��ķ��ȥ�M��y��t��⛼��ζ�Һ��ȵ�Ҫ�󣬶��ԓ�ڱ��C��Ʒ��ȡ��,��г�ִ��Ե�ǰ��ȥ�{(di��o)��t��⛵ļ��ζ�Һ�ĝ�ȁ�M��Ʒ��ˮ�|(zh��)��Ҫ��,��@�Ӝy��Ĕ�(sh��)��(j��)�Ŝʴ_��

1.4 ��Һ��,��̶Ⱦ�

��ˮ��БҸ��һ�㶼��Һ�ܵĳ��ڹܿڏ�,��Ø˜��Һ��ȡ��ˮ�ӕr��ˮ��еđҸ��ￂ�Ǻ��yȡ��,��@�Ӝy��ֻ�ǲ��ȥ��Ҹ��ˮCODֵ,��һ��棬��ʹ��ȡ��һ��ּ�С�đҸ��,��Һ��̫С,��ȡ�M�̶��Ҫ�ĕr�g�^�L��ˮ��ѓu��đҸ��u�³�,��ȡ��Ҳ�ǘO��,��팍�Hˮ�|(zh��)��r��ˮ��,��@�Ӝy��ĽY(ji��)��ݱ��`��ܴ��ü��ڵ��Һ��ȡ��ˮ��Ʒ�y��COD�o��y��_�ĽY(ji��)��,��ȡ��ˮˮ��؄e��Ҹ��w��ˮ�ӕr��һ��Ҫ��Һ��ԼӸ��,��׵Ŀڏ��Ӵ�,��ʹ�Ҹ��Կ��룬�ٌ��̶Ⱦ��M��У��,��ʹ�y��ӷ��,��

2 �{(di��o)��t��⛘˜��Һ�ĝ�Ȼ��

�ژ˜�COD��У��t��⛵ĝ��һ��0.25mol/L,��ژ�Ʒ�y��r�ļ��10.00mL,��ˮȡ��20.00mL��ˮ��COD��^�ߕr,��һ��ȡ��Ʒ��ϡጘ�Ʒ�ķ��M��ϗl��,��ˮ�؄e��ԭˮ��f��oՓ��ȡ��߀��ϡ�ˮ�Ӷ��ܱ��C��ȡ��Ʒ��Ĵ��,��@�r��ԓ�m��{(di��o)��t��⛘˜��Һ�ĝ�Ȼ��,��ṩ��ֵ��ˮ�ۺ͢܁��f,��ʹ��ȡ��ߵ�50.00mL,��10.00mL��Ȟ�0.25mol/L��t��⛘˜��Һ�r��^�͵�CODˮ�|(zh��)��f��@�^��,��˕r��m��{(di��o)��t��⛘˜��Һ�ĝ�Ȼ��,��ʹ��Һ��ʣ��t��m��l(f��)�F(xi��n),��t��⛝�Ƚ��͵�0.025mol/L�r,��ĵζ��K�c��^�죬ɫ׃��@��,��Ԍ�COD�^С�ĳ�ˮ�ۺ͢�,��h�Ý�Ȟ�0.05 mol/L��t��⛘˜��Һ;��ڸߝ�ȵ�ԭˮ�Ý�Ȟ�0.5mol/L��t��⛘˜��Һ��m��?sh��)��{(di��o)��ʹ��Ʒ�ĵζ��w�e�c�ζ��հ׵��w�e��@��Ĳ�p��,��

3 �{(di��o)��ζ�Һ��၆�F�@�˜��Һ�ĝ��

��၆�F�@��Ӌ�㹫ʽ��£�

C[(NH4)2Fe(SO4)2]=0.250×10.00/V[(NH4)2Fe(SO4)2]

��၆�F�@��Ȟ�0.1mol/L�r,��10.00mL��0.25mol/L��t��һ�c��,��ζ��၆�F�@��w�e��25.00mL;��t��⛱��Ʒ�е�߀ԭ��|(zh��)��һ��r,��၆�F�@�ĵζ��w�e��12.50mL��Ĝp�ٷ��ζ��`��ĽǶȁ��,��ʹ�ζ��w�e��20��50mL��,��˽��h��၆�F�@��{(di��o)��Դ��0.05mol/L(��С��0.05mol/L,��հ��၆�F�@��w�e��ڵζ��ܵ��ݷe50.00mL��ʼ�c�ͽK�c��Ҫ�x��(sh��)�ɴ�,��Ӵ��`��),��һ��0.055mol/L��ˡ��@��ʹ�ζ��հ׵��w�e��45mL��,��ʹ��Ʒ��w�e�c�ζ��w�e�^��m��,��

COD��Ӌ�㹫ʽ��

CODCr=(V0-V1)×C×8×1000/V

ʽ�С�C——��၆�F�@�˜��Һ�ĝ�ȣ�mol/L��

V——ˮ��w�e,��mL��

V0——�ζ��հוr��၆�F�@�˜��Һ��,��mL

V1——�ζ�ˮ�ӕr��၆�F�@�˜��Һ��mL

8——��(1/2)Ħ��|(zh��)��,��g/mol��

(C×8×1 000)/V�ஔ��၆�F�@��O2�ĵζ��TO2/(NH4)2Fe(SO4)2,��

T=C×8×1000/V

��V=20mL��C=0.1mol/L�r,��T=(0.1×8×1000)/20=40mg/mL;

��C=0.05mol/L�r,��T=(0.05×8×1000)/20=20mg/mL��

��Ҋ,��C�pС�r,��TҲ�pС��ԜpС�ζ��`��,��ߜy��Ĝʴ_��^��,��