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style="font-size:14px"><strong>SN-TR-12土壤有機碳恒溫加熱器/重鉻酸鉀氧化分光光度法</strong>（可提供中性版）<strong><strong>的</strong>主要參數：</strong></span></p><p> </p><p><span style="font-size:14px">1、溫度可調節范圍：32℃—200℃</span></p><p><span style="font-size:14px">2、恒溫精度：±2℃</span></p><p><span style="font-size:14px">3、升溫時(shí)間： (135℃)<15min</span></p><p><span style="font-size:14px">4、功耗：1.0~1.4kw</span></p><p><span style="font-size:14px">5、同時(shí)加熱樣品數：12個(gè)</span></p><p><span style="font-size:14px">6、電源電壓：AC220V±10％，50Hz</span></p><p><span style="font-size:14px">7、尺寸：435*290*105mm</span></p><p><span style="font-size:14px">8、工作環(huán)境：溫度0-50℃，濕度＜85%RH，無(wú)腐蝕無(wú)強磁干擾場(chǎng)合</span></p><p><span style="font-size:14px">9、具塞消解管，帶磨口玻璃塞</span></p><p><span style="font-size:14px">10、配套試管架</span></p><p><span style="font-size:14px"><strong></strong></span></p><p><br /><span style="font-size:14px"><span style="font-family:times new roman"><strong>附：土壤有機碳的測定重鉻酸鉀氧化-分光光度法</strong></span></span></p><p><br /><span style="font-size:14px"><span style="font-family:times new roman">1 適用范圍本標準規定了測定土壤中有機碳的重鉻酸鉀氧化-分光光度法。 </span><br /><span style="font-family:times new roman">本標準適用于風(fēng)干土壤中有機碳的測定。本標準不適用于氯離子（Cl-）含量大于2.0×104 mg/kg的鹽漬化土壤或鹽堿化土壤的測定。</span><br /><span style="font-family:times new roman">當樣品量為0.5g時(shí)，本方法的檢出限為0.06%（以干重計），測定下限為0.24%（以干重計）。</span></span></p><p> </p><p><span style="font-size:14px"><span style="font-family:times new roman">2 規范性引用文件 </span><br /><span style="font-family:times new roman">本標準內容引用了下列文件或其中的條款。凡是不注明日期的引用文件，其有效版本適用于本標準。 </span><br /><span style="font-family:times new roman">HJ 613 土壤干物質(zhì)和水分的測定重量法</span></span></p><p><span style="font-size:14px"><span style="font-family:times new roman">HJ/T 166 土壤環(huán)境監測技術(shù)規范</span></span></p><p> </p><p><span style="font-size:14px"><span style="font-family:times new roman">3 方法原理 </span><br /><span style="font-family:times new roman">在加熱條件下，土壤樣品中的有機碳被過(guò)量重鉻酸鉀-硫酸溶液氧化，重鉻酸鉀中的六價(jià)鉻（Cr6+）被還原為三價(jià)鉻（Cr3+），其含量與樣品中有機碳的含量成正比，于585 nm波長(cháng)處測定吸光度，根據三價(jià)鉻（Cr3+）的含量計算有機碳含量。</span></span></p><p><br /><span style="font-size:14px"><span style="font-family:times new roman">4 干擾和消除 </span><br /><span style="font-family:times new roman">4.1 土壤中的亞鐵離子（Fe2+）會(huì )導致有機碳的測定結果偏高?？稍谠嚇又苽溥^(guò)程中將土壤樣品攤成2～3 cm厚的薄層，在空氣中充分暴露使亞鐵離子（Fe2+）氧化成三價(jià)鐵離子（Fe3+）以消除干擾。 </span><br /><span style="font-family:times new roman">4.2 土壤中的氯離子（Cl-）會(huì )導致土壤有機碳的測定結果偏高，通過(guò)加入適量硫酸汞以消除干擾。</span></span></p><p><br /><span style="font-size:14px"><span style="font-family:times new roman">5 試劑和材料 </span><br /><span style="font-family:times new roman">除非另有說(shuō)明，分析時(shí)均使用符合國家標準的分析純化學(xué)試劑，實(shí)驗用水為在25℃下電導率≤0.2mS/m的去離子水或蒸餾水。</span></span></p><p><span style="font-size:14px"><span style="font-family:times new roman">5.1 硫酸：ρ（H2SO4）=1.84 g/ml。</span></span></p><p><span style="font-size:14px"><span style="font-family:times new roman">5.2 硫酸汞 </span><br /><span style="font-family:times new roman">5.3 重鉻酸鉀溶液：（K2Cr2O7）=0.27 mol/L </span><br /><span style="font-family:times new roman">c稱(chēng)取80.00 g重鉻酸鉀溶于適量水中，溶解后移至1000 ml容量瓶，用水定容，搖勻。該溶液貯存于試劑瓶中，4℃下保存。 </span><br /><span style="font-family:times new roman">5.4 葡萄糖標準使用液：ρ（C6H12O6）=10.00g/L </span><br /><span style="font-family:times new roman">稱(chēng)取10.00 g葡萄糖溶于適量水中，溶解后移至1000 ml容量瓶，用水定容，搖勻。該溶液貯存于試劑瓶中，有效期為一個(gè)月。</span></span></p><p><br /><span style="font-size:14px"><span style="font-family:times new roman">6 儀器和設備 </span><br /><span style="font-family:times new roman">6.1 分光光度計：具585 nm波長(cháng)，并配有10 mm比色皿。</span></span></p><p><span style="font-size:14px"><span style="font-family:times new roman">6.2 天平：精度為0.1 mg。 </span><br /><span style="font-family:times new roman"><strong>6.3 </strong></span>SN-102TR土壤有機碳恒溫加熱器/消解器/消解爐（可提供中性版）<span style="font-family:times new roman"><strong>：溫控精度為135±2℃℃。恒溫加熱器帶有加熱孔，其孔深應高出具塞消解玻璃管內液面約10 mm，且具塞消解玻璃管露出加熱孔部分約150 mm。</strong></span></span></p><p><span style="font-size:14px"><span style="font-family:times new roman"><strong>6.4 具塞消解玻璃管：具有100 ml刻度線(xiàn)，管徑為35～45 mm。 </strong></span><br /><span style="font-family:times new roman"><strong>注：具塞消解玻璃管外壁必須能夠緊貼恒溫加熱器的加熱孔內壁，否則不能保證消解*。</strong></span><br /><span style="font-family:times new roman">6.5 離心機：0 ~3000 r/min，配有100 ml離心管。 </span><br /><span style="font-family:times new roman">6.6 土壤篩：2 mm（10目）、0.25 mm（60目），不銹鋼材質(zhì)。</span></span></p><p><span style="font-size:14px"><span style="font-family:times new roman">6.7 一般實(shí)驗室常用儀器和設備。</span></span></p><p> </p><p><span style="font-size:14px">SN-TR-12<strong><strong>第三方檢測國標法<strong>土壤有機碳恒溫消解器</strong></strong>大量現貨，可當天發(fā)貨，專(zhuān)業(yè)的化學(xué)知識，*的售后，相信自己的眼光，青島尚德，不會(huì )讓您選擇錯誤。</strong></span></p> </div> <div id="bd8lmiie" class="lyNyProDetail_ConTit" id="cpzx"><p>產(chǎn)品咨詢(xún)</p></div> <div id="bd8lmiie" class="ly_msg"> <link rel="stylesheet" type="text/css" href="/css/MessageBoard_style.css"> 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