專門用來檢測水質(zhì)中尿素的含量,對游泳池水的標(biāo)準(zhǔn)來講,游泳池水中尿素含量的檢測是國家游泳池水質(zhì)管理的標(biāo)準(zhǔn)之一。然而,每年在全國各個城市游泳池的檢查中,不合格的游泳池水質(zhì)尿素含量的超標(biāo)大概占整個不合格比率的30%-40%??梢姡斡境厮|(zhì)尿素的含量的監(jiān)測,控制從某種意義上講可能直接關(guān)系的泳池水質(zhì)的合格與否。下面先說一說游泳池水質(zhì)尿素的測定方法如下:
游泳水中尿素測定方法
二乙酰一肟分光光度法
1 原量
尿素與二乙酰一肟及安替比林反應(yīng)呈現(xiàn)黃色,在波長460nm處吸收峰。
2 儀器
2.1 25ml棕色具塞比色管
2.2 水浴
2.3 分光光度計
3 試劑
3.10.2%二乙酰一肟溶液:稱取0.2g二乙酰一肟[CH3COC:(NOH)CH3]溶于10%乙酸中,并稀釋至100ml,保存于棕色瓶備用。
3.20.2%安替比林溶液:稱取0.2g安替經(jīng)林(1,5-二甲基-2-苯-3-吡唑酮C6H5NN(CH3)C(CH3):CHC:O),溶于1+1硫酸中并用混酸稀釋至100ml,棕色瓶中保存。(注:硫酸濃度大于1+1時,顯色緩慢且操作不便。)
3.3尿素標(biāo)準(zhǔn)溶液:準(zhǔn)確稱取0.1000g尿素于小燒杯中,加少量純水溶解后轉(zhuǎn)入1000ml容量瓶中,加0.1ml氯仿并用純水定容,此液每ml含0.1mg尿素。冷藏保存。
3.4尿素標(biāo)準(zhǔn)使用溶液,準(zhǔn)確吸取尿素標(biāo)準(zhǔn)儲備溶液10.00ml于100ml容量瓶中,用純水定容,此液每ml含0.01mg尿素。
4 分析步驟
4.1吸取水樣10ml(尿素含量在0.001~0.015mg范圍內(nèi))于25ml棕色具塞試管中,另取棕色具塞試管加入尿素標(biāo)準(zhǔn)使用液0、0.1、0.3、0.5、0.7、0.9、1.1、1.3、1.5ml,并用純水稀釋至25ml。(注:顯色后溶液遇光退色,故需用標(biāo)色法)。
4.2 于上述各管加入1.0ml二乙酰—肟溶液,混均。再加安替比林溶液2.0ml,混勻。
4.3將上述試管在沸水浴中加熱50min。取出并在流動的自來水中冷卻2min。立即以純水為對照,在460nm處,用1cm比色皿,測定各管吸光值(加熱45~55min,呈深色,若再延長時間吸光值下降)。
4.4 以濃度對照吸光值,制備標(biāo)準(zhǔn)曲線。以水樣吸光值從曲線上查出尿素含量。
5 計算

C——水樣中尿素濃度mg/L;
M——從曲線上查得的尿素含量,?g;
V——水樣體積,ml。
了解了游泳池水質(zhì)尿素的檢測方法,接下來要找方便,高效的,準(zhǔn)確的工具儀器,使得游泳池管理者能夠隨時隨地了解尿素的含量情況。這里推薦深圳科瑞德的檢測精靈:檢測精靈不但能夠檢測到游泳池水中的總氯,余氯 ,PH,硬度等參數(shù),更重要的是推出了新的功能:尿素含量的檢測,所以也叫尿素檢測儀,檢測結(jié)果以數(shù)字顯示出來,讓您一看就知道什么時候要加藥、該加多少藥;并且什么時候要補(bǔ)水,該補(bǔ)多少水。有了百靈達(dá)檢測精靈,讓您的游泳池水質(zhì)長期保持清澈、湛藍(lán)!尿素不再超標(biāo)!
尿素檢測儀圖片
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