共查询到16条相似文献，搜索用时 187 毫秒
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文章采用EDTA络合滴定法对ACQ木材防腐药剂中有效成分铜含量进行测试研究,同时用原子吸收光谱法对样品进行同步检测分析。结果表明,采用EDTA滴定法测定ACQ防腐剂中铜含量,检测结果重复性好,准确度、精密度高,且操作简便,是一种非常适合于ACQ木材防腐剂生产中质量监控的快速检测方法。 相似文献
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鉴于戊唑醇优异的杀菌功效,目前已逐渐被引入木材防腐行业.然而,时于木材防腐剂中戊唑醇的检测,尚处于研究阶段.本试验采用反相高效液相色谱法,样品回收率可达97.7%.该方法简单、有效,可用于对木材防腐剂中戊唑醇的定量分析. 相似文献
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固相萃取-高效液相色谱法测定5种防腐木材中戊唑醇 总被引：1，自引：0，他引：1
采用高效液相色谱法测定防腐木材中戊唑醇含量,选择樟子松、南方松、赤松、花旗松和杉木作为试材,分别采用阴、阳离子固相萃取柱进行样品前处理。得出:阴离子固相萃取柱适合南方松和杉木的样品前处理,阳离子固相萃取柱适合樟子松、赤松、花旗松的样品前处理。并进行了精密度分析,验证了方法的准确性。 相似文献
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文章分析了ACQ木材防腐剂中DDAC活性成分测量不确定度的来源,并对测定过程中产生的不确定度分量进行了评估,结果表明样品重复测定的准确度是影响DDAC测量不确定度的主要因素,DDAC扩展不确定度为0．059％。 相似文献
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采用高效液相色谱法检测木材中戊唑醇含量时,木材中抽提物的存在会影响戊唑醇的出峰效果.文章采用PCX固相萃取处理方法,以探讨其对木材抽提物的去除效果.试验结果表明预处理方法可有效去除干扰戊唑醇色谱峰的木材抽提物,提高木材中戊唑醇测定的精密度和准确度. 相似文献
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检测木材防腐剂工作液的浓度,可监控防腐木材的质量和控制生产成本。通过采用折射计测定木材防腐剂工作液的折射率后发现,木材防腐剂工作液的折射率与其浓度之间存在良好的线性关系,相关系数r值大于0.999。只需用折射计测得未知溶液的折射率,便可计算出木材防腐剂工作液的浓度。因此可作为生产上快速检测木材防腐剂工作液浓度的一种方法。该方法操作简单、快速、重复性好,能在一定程度上控制防腐木材产品的质量和生产成本,可在生产中进行推广使用。 相似文献
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本文依据国家标准GB/T14074—2006,用滴定法测量脲醛树脂中游离甲醛含量,详细分析了测量过程中的各个影响因素,对检测结果的不确定度进行了评定,在测量过程中,重复性对不确定度贡献比较大。 相似文献
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木材防腐剂及其处理材所引起的金属腐蚀,日益引起人们的广泛关注。金属腐蚀产物会使金属附近的木材降等,从而导致连接强度减弱和结构完整性受损。笔者介绍了国内外关于铜基木材防腐剂及其处理材对金属的腐蚀性方面的研究进展,并在此基础上分析和展望了今后铜基木材防腐剂及其处理材对金属的腐蚀性方面的研究重点。 相似文献
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Bruno D. Mattos Tainise V. Lourençon Luis Serrano Jalel Labidi 《Wood material science & engineering》2016,11(4):209-216
This study aims to evaluate the chemical composition of wood and extractives of Pinus taeda and Schizolobium parahyba (guapuruvu) as potential feedstock for new applications in the biorefinery industry. For this purpose, their content of α-cellulose, hemicellulose, insoluble lignin, hot water solubility, NaOH1% solubility, inorganic materials (ash), and monomeric sugars by high-performance liquid chromatography was quantified. Attenuated total reflectance infrared spectroscopy and thermogravimetric analysis were also used to complete the physicochemical characterization of the studied woods. The extractives were obtained by soxhlet extraction with ethanol:toluene and dichloromethane and identified with pyrolysis-gas chromatography/mass spectroscopy technique. The results showed that guapuruvu wood has the higher amount of hemicellulose (16%) when compared to pine wood (10%), which resulted in higher solubility in alkali solution. Furthermore, in relation to other biomasses, the two woods presented more percentage of lignin and minor content of hemicelluloses. The P. taeda wood presented the highest percentage of extractives mainly composed of fatty acids and aromatic hydrocarbons, while guapuruvu wood had a higher percentage of phenolic compounds and also fatty acids. Both the materials have low content of extractives with dichloromethane and were mainly composed of lipophilic compounds. 相似文献
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Wood samples of apitong (Dipterocarpus grandiflorua) and ilang-ilang (Ilang-Ilang C. dadloyi) and feces of termites [Cryptotermes brevis (Walker)] fed on these woods were collected from University of the Philippines, Los Baňos. Lignin of each sample was isolated by Björkman’s procedure. There was no significant difference in 1H nuclear magnetic resonance (NMR) spectra or in the methoxyl content between Björkman lignins from original woods and termite feces. Differences were detected in the contents of aliphatic and unconjugated phenolic hydroxyl groups, suggesting minor structural changes of lignin during digestion by termites. In addition, the ratio of syringyl to guaiacyl nuclei of Björkman lignin from termite feces determined by 1H NMR spectra was higher than those from the original woods. The molar ratio of syringyl to guaiacyl nuclei of termite feces was higher than those from the original woods as determined by alkaline nitrobenzene oxidation. These results suggest that the structural changes of lignin in the termite gut are due to the insignificant formation of C-C linkages in guaiacyl nuclei. It was concluded that there were minor changes in the structural features of lignin under mostly anaerobic conditions, in contrast to the significant changes that occur through biological modification under aerobic conditions. 相似文献