重量法测定鈹虽然准确,但費时,手續繁复,应用比色法进行测定,近年来已广泛地試驗,一般多是应用在测定低含量的鈹,现試提出一个能测定較高含量鈹的方法。 G.H.OSborn等曾用硼砂在鉑坩堝中熔矿,用碱提取,过滤后在硼酸—氢氧化鈉介貭中,用对—硝基苯偶氮甲苯二酚为显色剂,进行光度法比色測定。Pollock提出用氟化鈉熔矿,以硫酸除氟离子后,在酒石酸的碱性溶液中,加入上述显色剂进行比色。有建議在鉄坩堝中用过氧化鈉熔矿,过滤除去残渣,在弱碱性溶液中硼酸緩冲剂存 Gravimetric determination of beryllium though accurate, but time-consuming, complex procedures, the determination by colorimetric method, has been widely tested in recent years, mostly used in the determination of low levels of beryllium, is now proposed to determine a higher content of beryllium method. GHOSborn et al. Used borax to melt the ore in a platinum crucible, extracted with alkali, and filtered in a boric acid-sodium hydroxide medium, using p-nitrophenylazohydroxydiphenol as a color former, and photometric colorimetric Determination. Pollock proposed to use sodium fluoride melting, with fluoride ions in sulfuric acid, alkaline solution of tartaric acid, the above color reagent for colorimetric. It is advisable to use sodium permanganate in 鉄 crucibles, remove the residue by filtration and store the boric acid buffer in a weak alkaline solution