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class="inside_rnewtime">點擊次數：1006 發布時間：2019-07-04</div> <div class="inside_rnewcon"> <div>　　</div><div>　　水質硬度是水質參數的一個重要指標，它反映了除鈉、鉀離子以外所有溶解在水中的金屬離子濃度的總和。由于自然水中除鈣、鎂離子外，其余的硬度離子存量不足3%，因此水質硬度通常定義為鈣、鎂離子的總和。</div><div>　　</div><div>　　水質硬度按加熱后能否產生沉淀又分為暫時性硬度和性硬度。由于水中含有的由重碳酸鈣與重碳酸鎂形成的硬度經煮沸后可去除，因此稱為暫時性硬度。而鈣、鎂、硝酸鹽、硫酸鹽所構成的硬度經煮沸后無法消除，因此稱為性硬度。</div><div>　　</div><div>　　在日常生產及生活中，控制水質硬度對于產品品質及人體健康都有著顯著的影響。例如：紡織與印染工業要求用水的水質硬度低于3mmol/L，印染時水質硬度應低于0.35mmol/L。如果超過此硬度，水中的鈣、鎂鹽類會與肥皂發生作用，從而導致紡織品出現斑點、鮮艷度降低等問題。對于飲用水，高硬度的水則會導致泡茶時口感不佳。嚴重時，水具有苦澀味，飲用后可能導致腸胃不適。</div><div>　　</div><div>　　水的硬度決定于鈣鎂等鹽類的含量，由于鈣鎂等的酸式鹽的存在而引起的硬度叫做碳酸鹽硬度。當煮沸時，這類鹽類分解，大部分生成碳酸鹽沉淀而除去。習慣上把它叫做暫時硬度。由鈣鎂的氯化物、硫酸鹽、硝酸鹽等引起的硬度叫做非碳酸鹽硬度。由于這些鹽類不可能借煮沸生成沉淀而除去，因此習慣上叫做硬度。碳酸鹽硬度和非碳酸鹽硬度之和就是水的總硬度。硬水不適宜于工業上使用，如鍋爐里用了硬水，經長期燒煮后，能生成鍋垢，既浪費燃料，又易阻塞管道，造成重大事故。</div><div>　　</div><div>　　水質硬度分析儀是采用滴定比色法，在線實時監測水硬度的重要儀表。它能夠做到快速、簡單、和經濟的測量水質硬度。為了保證水質硬度分析儀的正常運行，我們建議工作人員可根據現場情況，定期地對儀器維護。維護前，須關閉儀器電源和進水口。而儀器維護也分很多細節，今天，我們先來說說水質硬度分析儀如何更換硬度試劑。</div><div>　　</div><div>　　硬度試劑是消耗品，當試劑耗盡或失效，務必更換新的試劑。具體更換步驟如下：</div><div>　　</div><div>　　1.打開儀器蓋門，打開試劑瓶瓶蓋。</div><div>　　</div><div>　　2.打開新的試劑瓶蓋，將接有吸管的嵌入圈插入試劑瓶內，并擰緊瓶蓋，替換掉原來的失效試劑。</div><div>　　</div><div>　　3.注意要把試劑瓶和連接器固定并擰緊。</div><div>　　</div><div>　　4.安裝好的試劑安置于儀表內底座。</div><div>　　</div><div>　　5.導出程序菜單服務I(或者SERVICE)，復位試劑容量100%。</div><div>　　</div><div>　　需注意的是，未使用的試劑應保存在陰涼處。避免陽光直射。</div> 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