粗大浓稠硕大噗嗤噗嗤h,精品人妻码一区二区三区,国产av无码专区亚洲精品,日韩a片无码毛片免费看小说

該電極端部為惰性貴金屬<\/span>-----<\/span>鉑金制成。它是氧化還原電位測定、電位滴定和極譜法測定中不可缺少的指示電極，也是化學(xué)修飾電極重要原電極，在水質(zhì)監(jiān)測、環(huán)境生態(tài)、土壤底泥、金屬腐蝕研究和化學(xué)化工中有廣泛的應(yīng)用。<\/span><\/span><\/strong> <\/p>

<\/span><\/span>使用及維護(hù)<\/span><\/strong> <\/p>

1<\/span>、用前以水浸泡并清洗電極表面。測定時(shí)可用各種<\/span>pH/mV<\/span>計(jì)連用，與甘**電極或銀氯化銀配對，將電極直接插入樣品，電位穩(wěn)定時(shí)讀數(shù)。<\/span><\/span><\/strong> <\/p>

2<\/span>、原位測定土壤、底泥等尤需仔細(xì)，勿使端部變形、表面毛糙，暫時(shí)不用時(shí)可浸泡入水中，長久不用冊干放于盒內(nèi)。<\/span><\/span><\/strong> <\/p>

3<\/span>、電極用久后，表面氧化膜或吸附物，應(yīng)用<\/span>0.2MHc1v1<\/span>—<\/span>0.1MNac1<\/span>—<\/span>0.2%Na_{2<\/sub>SO3<\/sub><\/span>混合液加熱至<\/span>70<\/span>℃<\/span>處理<\/span>2<\/span>小時(shí)，然后在醌氫醌飽和的<\/span>0.05m<\/span>鄰苯二甲酸氫鉀溶液中檢測電位<\/span>E<\/span>，應(yīng)符合下式：<\/span><\/span><\/strong> <\/p>}

E=455<\/span>—<\/span>0<\/span>。<\/span>09<\/span>（<\/span>t<\/span>—<\/span>25<\/span>）—<\/span>[59.1+0.2(t<\/span>—<\/span>25)pH<\/span><\/span><\/strong> <\/p>

其中：<\/span>pH<\/span>為<\/span>0.05<\/span>鄰苯二甲酸氫鉀溶液在<\/span>T<\/span>℃時(shí)的<\/span>pH<\/span>值。<\/span><\/span><\/strong> <\/p><\/div>