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为了节省硝酸银试剂,本文介绍以高锰酸钾作氧化剂,成功地测定了铬矿中的铬.一、操作步骤:称0.2g试样放入30ml预先盛有4～5g过氧比钠的铁坩埚中,拌匀并复盖1g过氧化钠,置于酒精喷灯上(或马弗炉内)加热熔融,待坩埚内熔体呈暗红色熔液时,再继续加热熔融1分钟,取下冷却,将坩埚放入已加有100ml左右水的500ml烧杯中,加5ml 4%高锰酸钾溶液,用水洗净坩埚,以硫酸(1+1)慢慢酸化后再过量20ml(控制体积在200～250ml),然后在电炉上加
In order to save the silver nitrate reagent, this paper describes the use of potassium permanganate as oxidant, successfully determined the chromium in chromium ore.Operation steps: Weigh 0.2g sample into 30ml pre-filled with 4 ~ 5g of sodium peroxide Iron crucible, mix and cover 1g sodium peroxide, placed in the alcohol torch (or muffle furnace) heating and melting until the crucible melt dark red liquid, then continue heating and melting 1 minute, remove Cooling, the crucible into the 500ml beaker has been added about 100ml of water, add 5ml 4% potassium permanganate solution, wash the crucible with water, sulfuric acid (1 + 1) slowly acidified and then an excess of 20ml (control volume at 200 ~ 250ml), then add in the electric furnace