CNS 3648-2003 Method of test for edible oils and fats-Determination of saponification value《食用油脂检验法-皂化价之测定》.pdf

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1、 1 印行年月 94 年 10 月 本標準非經本局同意不得翻印 中華民國國家標準 CNS 總號 類號 食用油脂檢驗法皂化價之測定 ICS 67.200.10 3648 N6083 經濟部標準檢驗局印行 公布日期 修訂公布日期 62 年 9 月 1 日 92 年 9 月 9 日 (共 1 頁 )Method of test for edible oils and fats Determination of saponification value 1. 適用範圍:本標準規定食用油脂類皂化價之測定法。 2. 方法:取試樣 (1)2 g 置於 250 mL 三角瓶中,以吸管加入 0.5N 氫氧化鉀酒

2、精溶液25 mL,在迴流冷凝器下加熱沸騰 1 2 小時,冷卻後趁瓶內之反應物未凝結成膠狀物之前,加入 1%酚 試液 (2) (phenolphthalein) 0.5 1 mL 當指示劑,用已先行標定的 0.5 N 鹽酸標準溶液滴定之。另取 0.5 N 氫氧化鉀酒精溶液 (3) 25 mL 作空白試驗,依下式計算其皂化價: 皂化價(mg KOH/g) ( )A1.56CSB 式內, S=試樣所需 0.5 N 鹽酸標準溶液體積 (mL) B=空白試驗所需 0.5 N 鹽酸標準溶液體積 (mL) A=試樣之重量 (g) C=鹽酸標準溶液之實際濃度 (N) 註 (1) 2g 之取樣量適合皂化價為 1

3、70 200 之油脂,其他可斟酌改變取樣量,使所加入之氫氧化鉀酒精溶液一半的量被中和。 (2) 若是顏色較深的油脂樣品,可利用 2% alkali blue 6B 0.5 1 mL 取代原來的酚 指示劑。 (3) 0.5N 氫氧化鉀酒精溶液之處理:每公升酒精中需加入氫氧化鉀 8 g與鋁片 (aluminium pellets) 5 g,迴流 1 小時後立即蒸餾使用;或每公升酒精中加入 aluminium tertbutylate 4 g,放置數天後取澄清液使用。 0.5 N 氫氧化鉀酒精溶液於配製完成後必須再放置數天,取澄清液並保存在有蓋的褐色瓶中備用。 相對應國際標準: ISO 3657: 1988 Animal and vegetable fats and oilsDetermination of saponification value 修訂日期:第一次修訂: 68 年 4 月 24 日 第二次修訂: 71 年 1 月 28 日

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