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<div>　　硫酸根測定儀的測定范圍一般在0-50ug/L，基本誤差在滿刻度50ug/L的±5%，其原理是通過將水中可溶硅與鉬酸銨生成的黃色絡(luò)合物，用還原劑將其還原成硅鉬藍(lán)，然后通過硅酸根檢測儀進(jìn)行測定。</div><div>　　想要提高硫酸根測定儀的靈敏度和準(zhǔn)確度，大家可以使用特制的長比色皿。然后利用示差比色法進(jìn)行測量。</div><div>　　硅酸根檢測儀所用試劑：</div><div>　　1.鉬酸銨溶液</div><div>　　稱取50g鉬酸銨溶于約500mL一級試劑水中。取42mL硫酸（相對密度1.84）在不斷攪拌下加入到300mL一級試劑水中，并冷卻到室溫。將鉬酸銨溶液加入到硫酸溶液中，用一級試劑水定容到1L。保存在聚乙烯塑料瓶中。</div><div>　　2.還原劑</div><div>　　稱取1.5g1-氨基-2萘酚-4-磺酸和7g無水亞硫酸鈉，溶于約200mL一級試劑水中。稱取90g亞硫酸氫鈉，溶于600mL一級試劑水中。將兩種液體混合后用一級試劑水稀釋至1L，若遇溶液渾濁時應(yīng)過濾后使用。用聚乙烯塑料瓶保存在冰箱中。</div><div>　　3.酒石酸溶液（100g/L）</div><div>　　硫酸根測定儀的檢測步驟：</div><div>　　取水樣100mL注入塑料杯中，加入3mL鉬酸銨溶液，混均后放置5min，加3mL酒石酸溶液，混均后放置1min；加2mL還原劑，混均后放置8min。將顯色液注滿比色皿，開啟讀數(shù)開關(guān)，檢測儀器上顯示的數(shù)值就是水中的硅含量。</div><div>　　檢測時的注意事項(xiàng)</div><div>　　1.檢測中所用試劑盡可能的保存在藥品冷藏箱內(nèi)。</div><div>　　2.藥品冷藏箱在使用和放置時應(yīng)遠(yuǎn)離熱源，與墻面的距離大于10cm，溫度調(diào)節(jié)不能一次調(diào)得過低。</div><div>　　3.如果藥品冷藏箱的蒸發(fā)器結(jié)冰霜比較厚時，按化霜鍵即可，或者是停電一段時間，使結(jié)霜自行溶解，不能用金屬或其他硬物刮刨。</div><div>　　4.每天檢查一次和記錄冰箱的溫度，必要時進(jìn)行除霜，每個月清潔一次冰箱。</div><div>　　5.配制好的藥劑要標(biāo)明名稱和配制日期。</div><div>　　6.水樣加入酒石酸或草酸掩蔽劑，可以防止水樣中磷酸鹽和少量鐵離子的干擾。</div><div>　　7.當(dāng)還原劑的溶液顏色變暗或有沉淀發(fā)生時，就表示還原劑已經(jīng)開始失效。使用時需要重新進(jìn)行配制。</div> 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