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用紫外分光光度法，于苯扎溴铵特征吸收峰的２５６ｎｍ波长下测定溶液中苯扎溴铵浓度。对苯扎溴铵浓度≤１６３２μｇ／ｍｌ的溶液，测定结果的相对标准偏差≤１７６％。
The concentration of benzalkonium bromide in the solution was determined by UV spectrophotometry at a wavelength of 256 nm characteristic absorption peak of benzalkonium bromide. For the solution of benzalkonium bromide concentration ≤163 2μg / ml, the relative standard deviation of the determination results was ≤176%.