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絮凝法预处理测定氨氮的加标方式探讨 被引量:1
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作者 朱文昌 《环境科学与管理》 CAS 2011年第12期134-137,共4页
加标是环境监测质量控制的重要措施之一。测定氨氮的过程中,絮凝后上清液的加标回收合格率较高,而理论上加标物质应参与包括预处理在内的样品测定全过程。在絮凝法预处理效果优化的前提下,为了探讨标准物质在分析过程中产生的损失,对加... 加标是环境监测质量控制的重要措施之一。测定氨氮的过程中,絮凝后上清液的加标回收合格率较高,而理论上加标物质应参与包括预处理在内的样品测定全过程。在絮凝法预处理效果优化的前提下,为了探讨标准物质在分析过程中产生的损失,对加标量与样品含量比值范围以及加标回收率分布进行了研究,发现絮凝造成氨氮损失了4.2%,由此提出将加标回收率合格范围的下限调整为85%是合适的。 展开更多
关键词 氨氮 絮凝预处理 加标方式 回收率 质量控制
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环境监测水质分析中加标回收实验回收率计算的研究 被引量:6
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作者 刘莉 《安徽冶金科技职业学院学报》 2005年第2期73-75,共3页
分析了环境监测水质分析中加标回收实验的基本方法,给出回收率计算的通式,探讨了用实验中间值计算回收率的可行性。
关键词 回收实验 加标方式 回收率 中间值
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加标回收实验的实施及回收率计算的研究 被引量:86
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作者 任成忠 毛丽芬 《工业安全与环保》 2006年第2期9-11,共3页
分析了加标回收实验的基本方法,给出回收率计算的通式,探讨了用试验中间值计算回收率的可行性。
关键词 回收实验 加标方式 回收率 中间值
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Effects of Different Processing Modes of Reconstituted Tobacco on Cigarette Quality 被引量:1
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作者 李力群 邱昌桂 +4 位作者 何建丽 纪旭东 高辉 杨蕾 杨式华 《Agricultural Science & Technology》 CAS 2016年第1期234-238,244,共6页
In order to explore the most suitable mode for the primary processing model of reconstituted tobacco, another two kinds of conditioning process schemes for reconstituted tobacco were designed based on the existing rec... In order to explore the most suitable mode for the primary processing model of reconstituted tobacco, another two kinds of conditioning process schemes for reconstituted tobacco were designed based on the existing reconstituted tobacco processing method. Comparative analysis and evaluation were conducted for moisture content uniformity, intrinsic chemical compositions, casing uniformity, blending uniformity and sensory quality of the samples from the three kind of processing modes. The results showed that loosing and conditioning or the vacuum conditioning pretreatment of the reconstituted tobacco could effectively reduce the difference in moisture content during the blending, and improve the casing uniformity and blending uniformity. Moreover, the samples with the loosing and conditioning pretreatment had higher total sugar and reducing sugar contents, which indicated that the loosing and conditioning pretreatment method was more favorable for the improvement of the intrinsic quality of cigarettes. In addition, the three kinds of aromatic components contents of cigarettes using the loosing and conditioning pretreatment were higher,and the casing uniformity, blending uniformity and overall sensory quality of this pretreatment were all superior to that of the other two kinds of reconstituted tobacco pretreatment methods. The contents of total sugar, reducing sugar as well as the three kinds of aromatic components of cigarettes processed with vacuum conditioning pretreatment were all slightly lower than those of the existing methods, but the casing uniformity and blending uniformity were improved, while it showed small difference in the sensory quality with the existing processing method. 展开更多
关键词 Reconstituted tobacco Processing method Moisture content Chemical index Casing uniformity Blending uniformity Sensory quality
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