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target="_blank">土壤有機碳恒溫加熱器</a>是一種用于土壤科學(xué)研究的儀器，主要用于測定土壤中有機碳的含量。其工作過(guò)程主要包括以下幾個(gè)步驟：<div>　　</div><div>　　1、準備階段</div><div>　　</div><div>　　-樣品準備：首先，需要將采集的土壤樣品進(jìn)行風(fēng)干、研磨和篩分處理，得到均勻的土壤樣品。</div><div>　　-儀器預熱：接通電源，預熱儀器至恒定溫度，通常是180°C至200°C之間。</div><div>　　</div><div>　　2、加熱階段</div><div>　　</div><div>　　-樣品稱(chēng)量：將適量的土壤樣品稱(chēng)量并放入加熱器的石墨消解管中。</div><div>　　-添加試劑：向消解管中加入適量的濃硝酸和硫酸混合溶液，以破壞土壤中的有機物，將有機碳轉化為無(wú)機碳。</div><div>　　-消解過(guò)程：將裝有樣品和試劑的消解管放入加熱器中，關(guān)閉蓋子，開(kāi)始加熱。在高溫和酸性條件下，土壤中的有機碳被氧化為二氧化碳，并隨氣流排出。</div><div>　　</div><div>　　3、恒溫加熱</div><div>　　</div><div>　　-溫度控制：加熱器的核心部分是溫度控制系統，它確保在整個(gè)消解過(guò)程中溫度保持在恒定水平。這個(gè)過(guò)程通常需要幾小時(shí)，具體時(shí)間取決于土壤樣品的復雜性。</div><div>　　-排放氣體：在加熱過(guò)程中，產(chǎn)生的二氧化碳氣體通過(guò)連接的管道排放到含有堿性溶液的吸收瓶中，被有效吸收。</div><div>　　</div><div>　　4、結束階段</div><div>　　</div><div>　　-冷卻取出：消解過(guò)程結束后，將消解管從加熱器中取出，冷卻至室溫。</div><div>　　-清洗處理：需要清洗石墨消解管和吸收瓶，以備下次使用。</div><div>　　</div><div>　　5、數據分析</div><div>　　</div><div>　　-計算含量：通過(guò)測量吸收瓶中堿性溶液的pH值或電導率，可以計算出土壤樣品中有機碳的含量。</div><div>　　</div><div>　　土壤有機碳恒溫加熱器的工作過(guò)程涉及樣品準備、恒溫消解、氣體排放和清洗等多個(gè)步驟。正確執行每個(gè)步驟對于獲得準確的測定結果至關(guān)重要。在實(shí)際操作中，還需要注意安全防護措施，防止酸性和堿性溶液對人體和設備造成傷害。</div> 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