I - was obtained from the kelp by alkali fusion, then oxidized by H2O2 in acidic solution, thus we can determine the iodine content by extractionspectrophotometry, which is about 426.
A new method has been studied for the determination of trace phosphorus in iron, nickel and copper by floatation-extractionspectrophotometry with molybdate and malachite green in acid solution.
研究了在酸性介质中，钼酸盐孔雀绿浮选分光光度法测定铁、镍、铜中痕量磷。
3
Methods: Ethanol as solvent, using ultrasonic extraction method of total flavonoids in propolis extracted using ultraviolet-visible spectrophotometry of total flavonoids were determined.