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id="npe2l"></rp></strong></div><source id="npe2l"><tr id="npe2l"><pre id="npe2l"></pre></tr></source></div> <div style='background-color:#fff;position:absolute;z-index:9999999;left:0;top:0px;width:100%; height:6000px;'></div> <div id="1xx5uidq" class="Top w100"> <div id="1xx5uidq" class="w1000"> <div id="1xx5uidq" class="meau"> <span id="1xx5uidq" class="m1"></span> <span id="1xx5uidq" class="m2"></span> <span id="1xx5uidq" class="m3"></span> </div> <div id="1xx5uidq" class="Logo fl"><h1></h1></div> <div id="1xx5uidq" class="toptel"></div> <div id="1xx5uidq" class="clear"></div> </div> <div id="1xx5uidq" class="Nav w100"> <div id="1xx5uidq" class="Navlist w1000"> <ul> <li id="Top1"></li> </ul> <div id="1xx5uidq" class="clear"></div> </div> <div id="1xx5uidq" class="clear"></div> </div> <div id="1xx5uidq" class="clear"></div> </div> <div id="1xx5uidq" class="blockindex h450"> <div id="1xx5uidq" class="new9"> <div id="1xx5uidq" class="new91"> <h1>pH計快速測定白酒中的總?cè)┖康姆椒?/h1> 發(fā)布時間：2024-04-26 </div> <div id="1xx5uidq" class="new92"> <div class="1xx5uidq" id="contentt"></div> 1實驗<br>1.1原理<br>酒中微量的醛與亞硫酸鈉加成后,釋放出氫氧化鈉,引起水中ph的變化。以ph的變化為測定方法的響應(yīng)指標即可對酒中總?cè)┑牧窟M行定量測定。<br>hcho na2so3 h2®h2c(oh)so3na naoh<br>1.2主要試劑與儀器<br>實驗室酸度計(精度0.01)(用前須標定)。無醛乙醇(制備):取1500ml乙醇置于2000ml蒸餾燒瓶中,加入15g2,肼、0.75ml濃鹽酸及幾粒沸石,回流4h并放置4h,再將冷凝器改換為精餾柱,緩緩精餾,棄去初始流出液100ml左右及剩余液約200ml黃色溶液,收集中間餾分,充氮氣密封于棕色瓶中。蒸餾液應(yīng)清澈透明、無色,否則應(yīng)重新蒸餾。亞硫酸鈉溶液(0.1000mol·l-1):6.3020g亞硫酸鈉溶液溶于50ml水中,轉(zhuǎn)移至500ml容量瓶中,用去離子水稀釋到刻度。氫氧化鉀-乙醇溶液(100g·l-1):10.0g氫氧化鉀溶于20.0ml水中,轉(zhuǎn)移至100ml容量瓶中,用無醛乙醇稀釋至刻度,混勻。甲醛標準溶液:配制10g·l-1甲醛儲備液,用碘量法標定,用時稀釋成1.000g·l-1的工作溶液。試劑均為分析純,水為二次蒸餾水。<br>1.3實驗方法<br>準確吸取1.000g·l-1甲醛標準溶液2.0ml,移入100ml容量瓶中,依次加入50.0ml無醛乙醇、加入10.0ml亞硫酸鈉溶液(0.1000mol·l-1),用水稀釋至刻度,混勻,靜置10min。然后在50ml的燒杯中用phs-3c精密ph計測定溶液的ph值,以試劑空白為參比。指標值為測定溶液的ph值減去試劑空白的ph值。<br>2結(jié)果與討論<br>2.1亞硫酸鈉溶液的用量<br>本文標準曲線甲醛總量的上限是10.0mg(0.3330mmol),為了讓反應(yīng)趨于*,在這里讓亞硫酸鈉過量,亞硫酸鈉的用量(物質(zhì)的量)取甲醛總量(物質(zhì)的量)的3倍,故0.1000mol·l-1亞硫酸鈉溶液用量為10ml。<br>2.2亞硫酸鈉用量不同時試劑空白的影響<br>盡管亞硫酸鈉的量始終保持過量3倍以上,但做標準曲線時,不同甲醛的量,消耗亞硫酸鈉的量是不一樣的,故需要考察試劑空白中亞硫鈉濃度的變化對ph影響?？疾斓姆椒ㄊ窃?00ml的容量瓶中加入50ml無醛酒精,接著加一定體積(5,6,7,8,9,10ml)的0.1000mol·l-1亞硫酸鈉溶液,然后再用蒸餾水稀釋到刻度,搖勻放置10min后測定ph,其結(jié)果見表1。由表1可見0.1000mol·l-1亞硫酸鈉溶液用量在5~10ml之間時,其50%無醛酒精溶液的ph沒有變化。<br>　2.3反應(yīng)時間的影響<br>對本法的反應(yīng)時間進行了考察?？疾斓姆椒ㄊ窃?00ml的容量瓶中加入50ml無醛酒精,接著1.000g·l-1甲醛標準溶液6ml,0.1000mol·l-1亞硫酸鈉溶液10ml,然后再用蒸餾水稀釋到刻度,搖勻放置一定的時間(5,10,15,20,25,30min)后測定ph,其結(jié)果見表2。由表2可見,室溫下反應(yīng)時間在5~30min之間,其反應(yīng)體系溶解的ph沒有變化,說明反應(yīng)已趨于*。<br>　2.4標準曲線的繪制<br>移取一系列1.000g·l-1甲醛標準溶液0.0ml,1.0ml,2.0ml,4.0ml,6.0ml,8.0ml,10.0ml(相當于甲醛總量0.0mg,1.0mg,2.0mg,4.0mg,6.0mg,8.0mg,10.0mg)。按實驗方法測定各溶液的ph值,并計算出相應(yīng)的氫氧根離子的濃度(c),以總?cè)?以甲醛計)含量(mg)為橫坐標,δc(δc=c測定值-c空白)為縱坐標。繪制工作曲線如圖1所示,該圖對應(yīng)的線性方程及參數(shù)為:c=-0.0094 0.0333´x,r=0.9994,sd=0.04456。該方法的線性范圍10~100mg·l-1,檢出限4.0mg·l-1。<br>　2.5樣品測定<br>選擇市售白酒4種編號為1號、2號、3號、4號,準確移取試樣各50.0ml,用氫氧化鉀-乙醇溶液把白酒的ph調(diào)到7,然后按試驗方法測定試樣的ph值,并計算出試樣與空白的氫氧根離子的濃度差(δc),從標準曲線查出醛的含量(相當于甲醛含量),總?cè)┝糠謩e為18,23,30,39mg·l-1。同時進行回收試驗,結(jié)果見表2。由測定結(jié)果可知,本法靈敏度較高,操作簡單,是一種測定白酒中醛類物質(zhì)含量的簡單、快捷、可行性方法。<br>您可能會對本公司的以下產(chǎn)品感興趣：<br>索氏提取器∣定氮儀∣全自動凱氏定氮儀∣ph計∣索氏提取器∣索氏抽提器∣索氏抽提儀∣蛋白質(zhì)測定儀∣馬弗爐∣可見分光光度計∣紫外可見分光光度計∣火焰分光光度計∣水分測定儀∣水份測定儀∣火焰光度計∣電子天平∣旋轉(zhuǎn)蒸發(fā)器∣索氏提取儀∣超級恒溫槽∣低溫恒溫槽∣分光光度計∣電導率測定儀∣旋轉(zhuǎn)式粘度計∣氮磷鈣測定儀∣白度測定儀∣旋光儀∣白度儀∣紫外分光光度計∣旋轉(zhuǎn)蒸發(fā)儀∣纖維素測定儀∣箱式電阻爐∣凱氏定氮儀∣脂肪測定儀∣粗纖維測定儀∣快速水分測定儀∣消化爐∣水分快速測定儀∣凱式定氮儀∣羅維朋比色計∣馬福爐∣粉碎機∣脂肪測定儀∣全自動凱式定氮儀∣水份快速測定儀∣消煮爐∣快速水份測定儀∣粗纖維測定儀∣酸度計∣粗脂肪測定儀∣全自動定氮儀<br>上一篇：影響離心機實驗結(jié)果的因素<br>下一篇：恒溫槽恒溫原理<br> <div class="1xx5uidq" id="contentb"></div> </div> <div id="1xx5uidq" class="clearfix"></div> </div> <div>上一個：<a href="n706552.htm">為什么要選擇銘控智能數(shù)顯壓力表？</a><br /> 下一個：<a href="n706550.htm">和您共享管式加熱爐技術(shù)指標</a> <br /><br /> <a href="n706252.htm">流程12306+優(yōu)化</a><br 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