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Abstract
A most simple, rapid and sensitive method for the determination of boron compounds using gas chromatograph (model GC-14B) is described. The method is based on the hydride generation technique. A standard sample of boric acid was well dried and mixed with about 50 mg of powdered LiAlH4 and diborane was generated by heating at 160°C. Diborane was trapped at liquid nitrogen temperature (−196°C). Factors effecting the diborane producability such as generation temperature, trapping time, and carrier flow rate have been critically studied and optimized. Boron was determined in the concentration range of 0.01–3 mg; the new system has a detection limit of 10 μg. Natural species that form gaseous hydrides and is expected to interfere with the measured diborane have been studied, It was found that phosphate interfered in this method unless its peak was clearly separated after replacing the GC column with a 1 m column packed with porapack Q. Finally the method was applied to two types of eye treatment solutions and one type of contact lenses washing solution; the results showed agreement with those of ICP-AES and spectrophotometer.