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紙漿與木材聚戊醣分析方法之研究

Study on the Pentosan Analysis of Pulp and Wood

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摘要


本研究之主要目的在探討與尋求能同時分析紙漿以及木材中聚戊醣含量,並能提供正確性高、誤差率低、小量試樣、操作性佳,以及能與國際接軌認證之方法。本研究以針、闊葉樹材試樣進行四種聚戊醣定量分析方法之探討,進一步就各方法之主要使用設備、一般化學藥品、特定化學藥品、總體操作特性等加以比較,並對各分項進行各定量分析法之優缺點評估。間苯二甲酚光度法對兩種針葉樹材,台灣二葉松與杉木之聚戊醣分析結果分別為3.7±0.1%、3.1±0.3%,闊葉樹材耳莢相思樹與玫瑰桉之結果分別為7.1±0.2%、6.6±0.2%,木糖之結果為94.1±1.7%。重量法對台灣二葉松與杉木之結果分別為4.0±0.3%、4.6±0.2%,耳莢相思樹與玫瑰桉之結果分別為10.4±0.7%、15.0±0.7%,木糖之結果為95.1±6.3%。 重量法使用之藥品最少,然操作方式最傳統最耗時,最大的困難是反應終點難以控制。溴化滴定法所費時間最短,易於操作,然需特別注意溫度之控制。醋酸苯胺比色法之主要使用設備、一般化學藥品、特定化學藥品(如糠醛)、各實驗之總體操作特性等均為四種方法中最多或最不穩定者。而間苯二甲酚光度法在實驗結果之準確性與精確性、使用藥品穩定性、試樣取樣量穩定性、操作簡易性等各方面均較其他三者佳,可以定量少量或低聚戊醣含量之試樣。 就正確性、誤差率、操作性、國際相互認證能力等各方面而言,間苯二甲酚光度法相當適合作為國內學術界、產業界,以及經濟部標準檢驗局對於聚戊醣定量分析之方法。

關鍵字

聚戊醣 糠醛 木糖 紙漿 木材 間苯二甲酚

並列摘要


The purpose of this study was to explore and search for the analysis method for pentosan determination in both pulp and wood with high accuracy and precision, low error, ease of performance, small quantity accessibility and global recognition. We have examined four major quantitative analyses on pentosan in two softwood and two hardwood, respectively. The gravimetric method, volumetric method, aniline acetate colorometric method and orcinol spectrophotometric method were compared and evaluated. Orcinol spectrophotometric method and gravimetric method showed better results than the other two. Pentosans determined by orcinol method in two representatives of softwood (Pinus taiwanensis and Cunninghamia lanceolata) for pulp and paper industry were 3.7±0.1%, 3.1±0.3%, 7.10.2%, respectively. The accuracy with xylose control was as high as 94.1±1.7%. The gravimetric method was proved the second best with pentosans of 4.0±0.3%, 4.6±0.2%, 10.4±0.7%, 15.0±0.7%, accordingly for the four species. The accuracy for xylose control was 95.1±6.3%. The gravimetric method used the least chemicals, but its whole procedure was the most time consuming of the four methods. End of the reaction was difficult to detect. Titration method showed the shortest performing time and ease of performance, but it crucially required the prompt cooling to freezing point. Aniline acetate colorometric method was the least feasible of all because of its low accuracy, high instrumental requirement, manifolds of chemicals demand, and the low overall performance. Orcinol spectrophotometric method performed well in almost all kinds of evaluation items, especially suitable for small quantification with high stability. It was well proved that orcinol spectrophotometric method had high accuracy, low error, and good performance with globally certifiable results.

並列關鍵字

Pentosan furfural xylose pulp wood orcinol

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