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(一)測(cè)量時(shí)的水溫應(yīng)維持在攝氏25度左右,溫度過(guò)高會(huì)使TDS值增加,影響正確性。
(二)液晶屏幕所顯示的數(shù)值即為TDS值,若TDS計(jì)顯示數(shù)字愈高,表示水中的物質(zhì)愈多。
(三)一般地區(qū)磁化過(guò)的自來(lái)水平均在250ppm左右,如果是純水系統(tǒng)能減至30ppm以下,當(dāng)純水的數(shù)值超過(guò)30ppm時(shí),就必須考慮更換RO濾膜或請(qǐng)技術(shù)人員驗(yàn)修。
(一)TDS僅能測(cè)出水中的可導(dǎo)電物質(zhì),但無(wú)法測(cè)出細(xì)菌、病毒等物質(zhì)。
(二)單獨(dú)依賴TDS水質(zhì)測(cè)試來(lái)判斷水質(zhì)是否能生飲,并不是較正確的作法;經(jīng)高溫?zé)o法滅絕的細(xì)菌或病毒,必須透過(guò)更精密的儀器才能測(cè)出來(lái)。
⑴毫克(mg)/升表明1升水中有多少毫克溶解性總固體。
⑵PPM溶液百萬(wàn)分率濃度單位。指100萬(wàn)毫升溶液中含有溶質(zhì)的毫升數(shù)或表明100萬(wàn)克溶液中含有溶質(zhì)克數(shù)。
⑶換算關(guān)系:1mg/l=1PPM
(4)它和電導(dǎo)率往往存在一種相通的關(guān)系,有時(shí)候TDS也可以用來(lái)表示電導(dǎo)率,兩者的關(guān)系:1TDS=2μS
其中μS為電導(dǎo)率的單位。
國(guó)家標(biāo)準(zhǔn)GB5749-2006《生活飲用水衛(wèi)生標(biāo)準(zhǔn)》中對(duì)飲用自來(lái)水的溶解性總固體
影響TDS值測(cè)試的因素:(TDS)有限量要求:溶解性總固體≤1000mg/L
水溫:TDS筆不可用于測(cè)量高溫水體(例如:熱開(kāi)水)
水的流速:TDS筆不能用于測(cè)量晃動(dòng)較大的水體
水質(zhì)污染:TDS筆不能用于測(cè)量污染濃度較高的水體
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