ISO 1897-4:1977 工業(yè)用苯酚、鄰甲酚、間甲酚、對甲酚、甲苯基酸和二甲苯酚 試驗方法 第4部分:不溶于氫氧化鈉溶液的雜質(zhì)目視試驗(甲苯基酸和二甲苯酚除外)
Phenol, o-cresol, m-cresol, p-cresol, cresylic acid and xylenols for industrial use; Methods of test; Part IV : Visual test for impurities insoluble in sodium hydroxide solution (Excluding cresylic acid and xylenols)