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本文在我们过去工作的基础上对氟硼酸—乙基罗丹明B比色测定硼的方法进一步予以改进,并在试样碱熔水提液中直接以硫酸调节酸度至pH≈5以沉淀分离大量硅酸,铌、钽和其它金属氢氧化物,效果良好,能满足化探工作需要。 试验部分 一、试剂 硼标准溶液 硼酸0.572克溶于水中并稀释至1000毫升,摇匀。此溶液1毫升含100微克硼。再稀释配制1毫升含2微克硼的标准溶液。
This paper based on our past work on the fluoroborate - ethyl rhodamine B colorimetric determination of boron further improved, and in the sample alkali aqueous extract directly sulfuric acid to adjust the acidity to pH ≈ 5 to precipitate a large number of separation Silicic acid, niobium, tantalum and other metal hydroxides work well to meet the needs of geochemical exploration. Experimental part A reagent boron standard solution 0.572 g boric acid dissolved in water and diluted to 1000 ml, shake. One milliliter of this solution contains 100 micrograms of boron. Re-dilute to prepare 1 ml of standard solution containing 2 μg of boron.