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ժҪֱԸˮpHֵ絼ʡؿźڲдڵļϸķýˮ絼ʻpHֵļһԶƼӰ׼ȷԵķ
ؼʣ糧ˮӰpHֵԶ
0
ŵҵķٷչ߲ٽ硢ٽͶ߲ԻѧˮƷʡҩƼˮƽҪԽԽߣˮලˮƽ߷׼ȷԣ߻ѧҩˮƽʹˮƷʹУDZ֤ˮϵͳͷֹεҪڣԻİȫҪá
ԳˮΪˮĸ߲¯УüӰڸˮpHֵѳΪҹ糧¯ڸˮpHֵ㷺ʹõķGB/T 121451999鼰豸ˮй涨¯У¯ѹ12.718.3 MPaҪˮ絼ʣӽ25 棩0.3 S/cmpHֵΪ8.89.325 棬ͭϵͳpHֵΪ9.09.525 棬ͭϵͳӰĶֱӰˮpHֵĴСøˮpHֵƼӰֱӡЧãʵУøˮpHֱֵӿƼӰصӰ졣
1ˮpHֵʵʲдڵ
11ˮpHֵľ
ʵоָˮpHֵڲʱԵѱ֤׼ȷԣԭڣ߲¯ˮˮʽϴ絼ʡ5S/cmʱˮӽھԵ壬ˮ缫ĦھԵ֮Ħɲɣʹ缫λEbͲαȵ缫λEc仯ھɵãڲвˮpHֵ޹صġErErӵźϣһDZˣpHֵ25 ʱ־ɲĵλÿ仯5.916 mVpHֵͻ0.1ʵУʱɵĵλɴXʮɴɺܴpHֵ
ڴˮĦľ⣬ԲȡؿɿӵأĦIJ־ͨߣԼĦͬʱڱ֤DZˮ£ܽͲٲʹȶϷֻܼٴˮȫ Ѱȫʦվղؼ
12¶ȶpHֵӰ
pHֵIJڵλʽڷDZ׼״̬²ˮpHֵصIJλ˹طʾ
E=E0+0.198 4 T lg a/n 1
ʽEصIJλmV
E0缫ĤλڳҺλαȵ缫λۺϵλmV
0.198 4 T lg a/nҺpHֵжӦϵĵλmV
˹ط̶¶T󵼣
dE/dT=dE0/dT+ 0.198 4lga/n+0.198 4Td lga/n dT 2
dE/dTΪ¶ÿ仯1϶λı仯dE0/dTΪ缫ı׼λ¶ϵʾ缫缫ĤϡڳҺαȵ缫ȵ¶йأͨв
0.198 4lga/nΪ¶ϵбn=1ʱ¶ÿ仯1 棬бʱ仯0.198 4 mVn=2ʱбʱ仯0.099 2 mVͨȫ
0.198 4Td lga/n dTΪҺ¶ϵҺӻȡƽⳣйءҺӻȡƽⳣ¶ȱ仯ˮвͬɶ仯޷ȷģͨв
¶Ȳķ޷ȫ¶ȶˮpHֵɵʵУˮָ25 ʱpHֵƫ25 ʱֵһ˱ϸˮ¶25±2 淶Χڡ
13УpHֵӰ
pHƵı궨һ㷨һpH6.86pH9.18pH4.0125 棩׼ҺжλȻһpH9.18pH6.86pH4.0125 棩׼Һб궨бʡ缫һֱ׼ҺУȶһʱ󣬲缫׼Һһȶĵ缫λ缫λﵽģǾһʱ䣬𽥴ﵽȶĵ缫λֶ궨DZڱ궨ʱ缫ڱ׼ҺпʱԳЩʹ缫λȶٱ궨DZԶ궨DZ2궨ʱй̶ƣݵλ仯Զѡȡ2ĶӦĵ缫ܴӦʱϳĵ缫缫λδȶͽж궨ܴ
14缫Ӱ
ĿǰpHֵʱò缫ڵ缫ĤϡȡԵԡ칤յصӰ죬ͬһĵ缫ҲȫͬҲӰˮpHֵ׼ȷԵ֮һ
15ˮpHֵ׼ɵӰ
ڸˮpHֵܴˮɡ¶ȡšУ缫صӰ죬ǴˮɵӰȫų˺ѱ֤ˮpHֵ׼ȷԡ
¯У¯ѹΪ12.718.3 MPaͭϽĸˮϵͳҪƸˮpHֵ8.89.325 棩ΧڡˮpHֵƷΧΪ±0.525 ʱֻҪ5.916 mVpHֵƷΧھͻ20%øˮpHֵΪӰźžֱӡЧãʵӦһѶȡ
ʵʸˮˮpHֵ9.3ֵС9.3УͭͭƵѹͭĸʴܽ⣬ʴϵͳӾֻĻΣֻЧʵĽ͡pHֵ߻ճͭܵİʴʹй©֮ʵʸˮˮpHֵС8.8ֵ8.8Уɸˮϵͳ豸͹ܵĸʴܽӾ磬丯ʴ¯Ӿˮڵij͸ʴɹܵ𻵣¹ʡ
2ˮ絼ʵIJ絼pHֵĹϵ
21ˮ絼ʵIJ
Һڵ糡¶ǨʵֵġҺһ壬ڵ缫˼һĽѹĵźžŴõҺĵ絼ʡ絼ʱҺĵʱָˮиӵܺ͡絼缫2壨DZ缫ΪͲʽṹȽȶҲصĸš
⣬絼ͨҺ迹תΪźŶõģܴˮɵӰ죬׼ȷʴߡ
22ֲݺ¶ȵӰ
£ˮ絼ʡ0.3S/cm25 棩Ӱ󣬸ˮpH8.89.3Χڣ絼ͨ16S/cmΧڱ仯ʱ絼ʽС缫漫ӰСֲӰϴ󣬿ԲõƵʵIJٷֲݵӰ졣 Դעᰲȫʦ
絼16 S/cmΧڱ仯絼¶ȵı仯Ϊֱߣ¶Ȳ԰ʽ3в
X25 棩=Xt /1 +£t-25 3
ʽX25 棩ˮΪ׼¶25 µĵ絼ʣ
Xtˮt ʱĵ絼ʣ
¡ˮ¶Ȳϵ
ˮ絼16S/cmΧڱ仯ʱ¿ȡ0.02/档
23ˮ絼ˮpHֵĹϵ
25 ˮ絼ʡ0.3S/cmʱˮеʶԵ絼ʵӰdzСˮӰ󣬰ˮΪҺǿҺĵʹˮ絼ʾֵʮʮ˸ˮ絼ʴСҪȡˮаŨȡˮаŨpHֵ͵絼֮ȷĹϵ
ݸˮ絼pHֵĹϵͨ絼ʼpHֵ
¹VGB׼ŷޱ׼òˮ絼ʷpHֵķˮpHֵ
24ˮ絼ʲȸߣƷΧ
ɱ1ԿͭϽĸˮϵͳˮpHֵ8.89.325 棩絼1.75.3 S/cmΧڱ仯絼ʿΪ±3.6 S/cm pHֵΪ±0.5 絼ʿƷΧpHֵ絼ʲȱpHֵȸߣõ絼ΪźŸ
3ˮӰƵĹϵ
ˮҲǼӰƵһҪָꡣ¯ˮˮӣΪָˮpHֵڿƷΧڣӰ󣻷֮٣ˮӰ١ͬĻ顢ͬϵͳˮĴСӰĹϵͬǶһĶӦϵΪʹˮpHֵڿƷΧУøˮźſƼӰͱָˮpHֵ׼ȷƷΧС󡢲ʵʩı׶ˡ
4ԶӰƼչ
ͨϷԿøˮpHֵƼӰֱӣǣˮpHֵӰضࡢpHֵƷΧС±0.5øˮpHֵƼӰʵʩѡĿǰͨźſƼӰеøˮΪźţˮ絼ʻpHֵΪźſƼӰڸˮС鸺ɱ仯ϵͳеڶ仯ˮpHֵѧģ鲻ͬ죬ҪȷźſƼӰľȡ׼ȷȲߡ ȫʦ
Ŀǰйصλһֶ๦ܷDZֱӲˮĵ絼ʣ25 桢ˮȶ֤絼ʲ׼ȷǰ£аѵ絼ʻpHֵĹܡDZͷϿͬʱʾˮ絼ֵpHֵøˮ絼ΪźŵͬʱԼˮpHֵͭϽĸˮϵͳ絼һ1.75.3 S/cmΧڣ25 ˮpHֵ8.89.3ΧڣpHֵԣ絼ʱpHֵƷΧҪ⣬ˮ絼ʵIJpHֵӰҪ٣׼ȷȸߣøˮ絼ʺpHֵĶӦϵͨˮ絼ʲźſƼӰʹpHֵ8.89.3ΧڣƼҩʱ׼ȷ侫Ⱥ׼ȷҲߡ

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