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題名 | 應用直接碘滴定法在金針乾製品二氧化硫殘留量快速檢測=Utilization of Iodine Direct Titration Method on Determination of Sulfur Dioxide Residue for Dried Daylily Products |
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作者 | 吳柏青; 郭曉怡; | 書刊名 | 宜蘭技術學報 |
卷期 | 7 2001.12[民90.12] |
頁次 | 頁17-26 |
分類號 | 412.37 |
關鍵詞 | 金針; 二氧化硫; 碘滴定; 通氣蒸餾法; Daylily; Sulfur dioxide; Direct iodine titration; Rankine method; |
語文 | 中文(Chinese) |
中文摘要 | 金針乾製品二氧化硫殘留量之法定標準檢測方法為通氣蒸餾法,但其檢測裝置較複雜,操作步驟亦非常繁雜且費時。直接碘滴定法曾廣泛應用於蔬果之二氧化硫殘留量檢測,雖然易受其他還原物質干擾,而影響其檢測準確度,但直接碘滴定法具有檢測裝置簡單、檢測時間較短、操作步驟容易等優點。雖然直接碘滴定法無法完全取代通氣蒸餾法,但仍可作為現場快速檢測參考用。比較直接碘滴定法與通氣蒸餾法之試驗結果顯示:操作員及檢測方法明顯影響二氧化硫檢測值,且兩種檢測方法可明顯區別六種二氧化硫殘留量不同之樣品。樣品之二氧化硫殘留量檢測值因操作員或檢測方法而異,而操作員之訓練與熟悉度明顯影響二氧化硫殘留量檢測值,顯示存在有方法誤差及人為誤差。金針乾製品可能含有干擾氧化之還物質,因此造成直接碘滴定法之檢測偏差,尤其在低二氧化硫殘留量時。由於萃取時間較短,以致低含水率、高二氧化硫殘留量之樣品之二氧化硫殘留量檢測值偏低。藉由直接碘滴定檢測值修正曲線,可以簡易、快速之直接碘滴定法代替繁瑣費時之通氣蒸餾法。直接碘滴定法亦可應用在金針乾製品加工作業流程中浸泡後金針及浸泡液樣品之二氧化硫殘留量檢測,僅需改變樣品前處理過程。 |
英文摘要 | Rankine method is the standard testing procedure to determine the sulfur dioxide residue of dried daylily products. This method is time-consuming and requires sophisticated testing apparatus and procedure. However, iodine direct titration method was well adapted to determine the sulfur dioxide residue of fruit and vegetable products. Although the reducing substances may affect the accuracy of measurement on sulfur dioxide residue, iodine direct titration method is a simple, fast method and requires a minimum of testing equipment. Even though iodine direct titration method can not substitute Rankine method completely, the testing results determined by iodine direct titration method could be used as quick reference. Based on the comparisons of experimental results from these two methods, operators and methods significantly affect the values of sulfur dioxide residue. These two methods can distinguish the difference of these six samples. The values of sulfur dioxide residue varied with various operators and methods. It seems that method and personal errors may exist. Based on the experimental results, dried daylily products may contain reducing substances that will disturb the oxidation reaction and affect the accuracy of direct iodine titration method, especially for samples with low sulfur dioxide residue. However, the testing value of sulfur dioxide residue for samples with low moisture content and high sulfur dioxide residue was lower due to short leaching time. By using the correction line, direct iodine titration method is a simple and fast way to determine sulfur dioxide residue of dried daylily products. Besides, with some modification of sample preparation process, direct iodine titration method can be used to determine the sulfur dioxide residue of soaked daylily and soaking solution samples. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。