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全自動定氮儀,凱氏定氮儀所需試劑的配制方法

時間:2022/2/18 9:41:25 瀏覽:

1制備溶液所需設備  全自動定氮儀

1.1電熱干燥箱:室溫~300℃。

1.2天平:分度值0.1mg

1.3A級玻璃量器:1000ml容量瓶、100ml容量瓶、5000ml試劑瓶、500ml燒杯、50mL燒杯、10mL刻度移液管、5mL刻度移液管

2氫氧化鈉溶液

稱取400g氫氧化鈉,500mL燒杯中,用去離子水溶解,冷卻至室溫,轉移至1000mL容量瓶,定容至刻度,搖勻備用

3硼酸溶液

稱取20.00g硼酸,用去離子水溶解并定容至1000ml容量瓶,搖勻移至試劑瓶備用,100:1比例加入甲基紅-溴甲酚綠混合指示劑,混勻。

4硫酸銨溶液

A溶液(0.140gN/10ml):取適量硫酸銨于105℃干燥箱中,干燥至恒重至少4h,取出放入干燥器中冷卻至室溫。用天平稱取6.6065g,,然后用去離子水溶解定容至100mL容量瓶,搖勻備用。

B溶液(0.014gN/10ml:10mLA溶液用去離子水定容至100ml容量瓶,搖勻備用。

C溶液(0.0014gN/10ml):10mLB溶液用去離子水定容至100ml容量瓶,搖勻備用。

5混合指示劑

5.1甲基紅乙醇溶液(1g/L):稱取0.1g甲基紅,溶于95%乙醇,95%乙醇稀釋至100mL

5.2溴甲酚綠乙醇溶液(1g/L):稱取0.1g溴甲酚綠,溶于95%乙醇,95%乙醇稀釋至100mL。

5.3混合指示劑:1份甲基紅乙醇溶液與5份溴甲酚綠乙醇溶液臨使用時混合。

6標準滴定溶液

鹽酸標準滴定溶液

按照表1的規定量取鹽酸,緩緩注入1000ml水中,冷卻,搖勻。

1



自動定氮儀
智能型定氮儀
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