氯化鈣標(biao)準(zhun)(zhun)(zhun)溶液 各(ge)濃(nong)度各(ge)規格的產品齊(qi)全 證標(biao)準(zhun)(zhun)(zhun)物(wu)質和其(qi)他(ta)標(biao)準(zhun)(zhun)(zhun)物(wu)質在使(shi)用(yong)上有什么(me)區別? 首先(xian)應明(ming)確(que),只有有證標(biao)準(zhun)(zhun)(zhun)物(wu)質提供的認定值或標(biao)準(zhun)(zhun)(zhun)值才能夠用(yong)于校準(zhun)(zhun)(zhun)、為其(qi)他(ta)物(wu)質賦值以(yi)及測(ce)(ce)量正(zheng)確(que)度確(que)認,并通過(guo)其(qi)使(shi)用(yong)來聲明(ming)測(ce)(ce)量結果的計(ji)量學(xue)溯源性。所有產品僅供科研使(shi)用(yong),不得用(yong)于食(shi)用(yong),醫療等(deng)其(qi)它(ta)用(yong)途。
產(chan)(chan)品(pin)名稱:pH標(biao)(biao)準(zhun)緩沖(chong)溶液(pH2.00) 產(chan)(chan)品(pin)規格:500ml 產(chan)(chan)品(pin)分類:標(biao)(biao)準(zhun)物質 儲(chu)存條件:4℃ 有(you)效期:12個(ge)月 用(yong)途(tu):校正pH計或酸度計 注(zhu)意事項:該pH值(zhi)是指在(zai)25℃條件下的值(zhi),,誤差范圍在(zai)0.01,注(zhu)意密閉(bi)保(bao)存 本產(chan)(chan)品(pin)僅(jin)供科研實驗用(yong),不(bu)做其它用(yong)途(tu)!
硫(liu)酸鈰銨(an)標(biao)準溶(rong)液(ye)(ye) 各(ge)濃度各(ge)規格的產(chan)品(pin)(pin)齊全 實驗小(xiao)技巧:不論(lun)何種類型滴定管注入溶(rong)液(ye)(ye)后,不得(de)有氣(qi)泡。酸式滴定管全部透明(ming)可(ke)(ke)以看(kan)見,便(bian)于(yu)操作,可(ke)(ke)直接將氣(qi)泡排出(chu)。堿式滴定管可(ke)(ke)用手指(zhi)擠(ji)壓下端玻璃球處,再將膠管向上彎(wan)曲,使溶(rong)液(ye)(ye)流(liu)出(chu)并將氣(qi)泡帶出(chu)。所有產(chan)品(pin)(pin)僅供科研使用,不得(de)用于(yu)食用,醫療等其(qi)它用途。
硫酸銅標準溶(rong)液(ye) 使用(yong)(yong)(yong)(yong)小技(ji)巧:滴定(ding)管(guan)應用(yong)(yong)(yong)(yong)硫酸重鉻酸鉀洗(xi)(xi)液(ye)洗(xi)(xi)滌(di),用(yong)(yong)(yong)(yong)自來(lai)水沖洗(xi)(xi)干凈(jing)后,再用(yong)(yong)(yong)(yong)蒸餾水洗(xi)(xi)滌(di)3次(ci)以(yi)上,以(yi)內壁不(bu)掛(gua)水珠為原則。使用(yong)(yong)(yong)(yong)前再用(yong)(yong)(yong)(yong)滴定(ding)標準溶(rong)液(ye)洗(xi)(xi)3次(ci)。(當滴定(ding)管(guan)是(shi)即洗(xi)(xi)即用(yong)(yong)(yong)(yong),未(wei)經控干時,應增加(jia)標準溶(rong)液(ye)洗(xi)(xi)滌(di)次(ci)數)。所(suo)有產品僅供科研(yan)使用(yong)(yong)(yong)(yong),不(bu)得(de)用(yong)(yong)(yong)(yong)于(yu)食用(yong)(yong)(yong)(yong),醫療等其它用(yong)(yong)(yong)(yong)途。