The organic acids in Hawthorn fruits from Henan Huixian and Tongbai Mountain were determined by gas chromatography-mass spectrometry method and 23 organic acids were identified.The main organic acids in Hawthorn fruit...The organic acids in Hawthorn fruits from Henan Huixian and Tongbai Mountain were determined by gas chromatography-mass spectrometry method and 23 organic acids were identified.The main organic acids in Hawthorn fruit were linoleic acid,oleic acid,linolenic acid,Citric acid,and hexadecanoic acid.There are almost the same kinds of organic acids in the two samples,but the contents of the organic acids in the two samples were very different.The contents of 8 main organic acids in Hawthorn fruits were determined by GC-MS selected ion monitoring(SIM)using internal standard curve method.The added standard recovery of the method was in the range of 92.8～103.2%,the relative standard deviations(RSD)were less than 3.5%,the correlation coefficients were more than 0.999 and the detection limits were in the range of 1.0～2.5 mg/L.展开更多
研究了用喷雾分解、干燥法由低品位氧化锌制备活性氧化锌的工艺。实验结果表明,低品位氧化锌矿经碳酸氢铵、氨水与水的质量比5∶8∶14的浸取液浸取,浸取率为94.67%。浸取液中的氧化锌含量可达23.3%(质量分数),用锌粉除杂净化,过滤除去...研究了用喷雾分解、干燥法由低品位氧化锌制备活性氧化锌的工艺。实验结果表明,低品位氧化锌矿经碳酸氢铵、氨水与水的质量比5∶8∶14的浸取液浸取,浸取率为94.67%。浸取液中的氧化锌含量可达23.3%(质量分数),用锌粉除杂净化,过滤除去杂质。滤液在喷雾干燥塔430℃的入口温度下喷雾热分解,再经过400℃下的流化床处理9 m in,可得到含量为99.5%(质量分数)高活性的氧化锌。其吸碘值为87.96 mg/g,活性显著高于蒸氨煅烧法所得的氧化锌,是一种新的高活性氧化锌的制备方法。展开更多
文摘The organic acids in Hawthorn fruits from Henan Huixian and Tongbai Mountain were determined by gas chromatography-mass spectrometry method and 23 organic acids were identified.The main organic acids in Hawthorn fruit were linoleic acid,oleic acid,linolenic acid,Citric acid,and hexadecanoic acid.There are almost the same kinds of organic acids in the two samples,but the contents of the organic acids in the two samples were very different.The contents of 8 main organic acids in Hawthorn fruits were determined by GC-MS selected ion monitoring(SIM)using internal standard curve method.The added standard recovery of the method was in the range of 92.8～103.2%,the relative standard deviations(RSD)were less than 3.5%,the correlation coefficients were more than 0.999 and the detection limits were in the range of 1.0～2.5 mg/L.
文摘研究了用喷雾分解、干燥法由低品位氧化锌制备活性氧化锌的工艺。实验结果表明,低品位氧化锌矿经碳酸氢铵、氨水与水的质量比5∶8∶14的浸取液浸取,浸取率为94.67%。浸取液中的氧化锌含量可达23.3%(质量分数),用锌粉除杂净化,过滤除去杂质。滤液在喷雾干燥塔430℃的入口温度下喷雾热分解,再经过400℃下的流化床处理9 m in,可得到含量为99.5%(质量分数)高活性的氧化锌。其吸碘值为87.96 mg/g,活性显著高于蒸氨煅烧法所得的氧化锌,是一种新的高活性氧化锌的制备方法。
