适用于氧化硼含量超过0.0006%（m/m）的产品。使用足够灵敏的仪器，应用下限可扩展至0.00008%（m/m）。将试样溶解在磷酸中。通过蒸馏将硼分离为硼酸甲酯。在pH值为7时，硼和姜黄素试剂之间形成红色络合物。在约550nm波长下分光光度法测量络合物。

Applicable to products having boron oxide contents of more than 0.0006 % (m/m). With sufficiently sensitive apparatus, the lower limit of application may be extended to 0.00008 % (m/m). The test portion is dissolved in phosphoric acid. Separation of the boron by distillation as methyl borate. Formation of a red coloured complex between the boron and the curcumin reagent at pH 7. Spectrophotometric measurement of the complex at a wavelength of about 550 nm.