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土壤试样先用硫酸、硝酸,后用氢氟酸消解,大米试样先于550℃焙烧,后用硫酸、硝酸消解。制得的试液用过硫酸铵氧化显色后,取部分试液于525nm处测锰。另取部分试液褪去高锰酸根的紫红色后,经三正辛胺——二甲苯苹取,氢氧化钠反萃取,用二苯卡巴肼显色,于540nm处测铬。土壤中锰、铬的回收率都在98％以上,测定结果与等离子直读光谱的数据颇为吻合。大米中锰、铬的回收率也都在98％以上。
Soil samples first with sulfuric acid, nitric acid, after hydrofluoric acid digestion, rice samples calcined at 550 ℃, after the use of sulfuric acid, nitric acid digestion. The resulting test solution was oxidized with ammonium persulfate color, take part of the test solution at 525nm manganese measured. Another part of the test solution faded purple permanganate, the three n-octylamine - xylene extract, sodium hydroxide back extraction, diphenylcarbazide color, measured at 540nm at chromium. The recoveries of manganese and chromium in the soil were over 98%. The measured results were in good agreement with the direct reading data of plasma. Manganese in rice, chromium recovery rates are also above 98%.