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一种用于检测自然水体中微量物质含量的系统设计
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作者 冯毅 姜永恒 《仪器仪表与分析监测》 2000年第2期49-51,共3页
本文介绍了一种能够对水中微量物质含量进行精确检测的智能化系统。该系统以双波长分光光度法为测试的基本原理 ,以硅光电池为检测传感器 ,以单片机为检测核心 ,具备自动检测、数据处理、显示、存储、打印等功能 ,而且也具有对痕量物质... 本文介绍了一种能够对水中微量物质含量进行精确检测的智能化系统。该系统以双波长分光光度法为测试的基本原理 ,以硅光电池为检测传感器 ,以单片机为检测核心 ,具备自动检测、数据处理、显示、存储、打印等功能 ,而且也具有对痕量物质的测定。 展开更多
关键词 分光光度法 自然水体 微量物质含量 检测系统
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Distribution and occurrence of trace elements in the No.14 coal from the Huolinhe mine 被引量:5
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作者 Xiangfei Bai Yue Wang Wenhua Li 《International Journal of Coal Science & Technology》 EI 2017年第3期199-213,共15页
Optical microscopy, and scanning electron microscopy in conjunction with energy dispersed X-ray spectrometry (SEM-EDX), have been used to study the minerals and the concentrations of 12 trace elements in the No.14 c... Optical microscopy, and scanning electron microscopy in conjunction with energy dispersed X-ray spectrometry (SEM-EDX), have been used to study the minerals and the concentrations of 12 trace elements in the No.14 coal from the Huolinhe mine, Inner Mongolia China. The distribution, affinity and removability of the trace elements were studied by float-sink experiments and petrological methods. A high mineral content, dominated by clay minerals, was found in the No.14 coal from the Huolinhe mine. The concentrations of As, Sb and Hg are relatively high compared to the average values for Chinese coals. As, Cr, Hg, Li, Mn, Pb are mainly associated with the minerals while Cd, Co, Ni, Sb, and Se are evenly distributed between the minerals and the organic matter. Be and Ba are mainly distributed in the minerals with a minor proportion in the organic matter. Most elements have a low organic affinity, although Sb, Se, Co, Cd, Ni are closely integrated with the organic matter. High theoretical removabilities are indicated for most trace elements. So it may be possible to lower the concentrations of trace elements during coal preparation. 展开更多
关键词 Trace elements Modes of occurrence - Organic affinity REMOVABILITY Huolinhe coal
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Microbiological, Physico-Chemical and Organoleptic Parameters of Apple Juice, Processed by Shungite
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作者 Melnyk Lyudmila Bessarab Oleksandr Matko Svitlana 《Journal of Food Science and Engineering》 2013年第9期489-495,共7页
This paper is dedicated to results of studying microbiological, physico-chemical and organoleptical parameters of apple juice processed by shungite. Shungite is a natural mineral which has special structural compositi... This paper is dedicated to results of studying microbiological, physico-chemical and organoleptical parameters of apple juice processed by shungite. Shungite is a natural mineral which has special structural composition, characterized by the existence of fullerenes and nanotubes. This paper explains the methods applied by the authors to prepare shungite for experimental research, to process apple juice by adsorbent, to determine the quantity of microorganisms in juice after it interacted with shungite, weight percentage of dissolvable dry solids, active acidity and quality parameters. In juice, processed by shungite, bacteria, fungi and yeast were detected. The authors made a comparison between microbial population in juice before and after its interaction with shungite. The paper refers to method under which shungite adsorbs bacteria, fungi and yeasts. The authors presented the results of studying dry solids content, active acidity of apple juice, processed by shungite at various temperatures and conducted assessment of apple juice quality after its interaction with sorbent. Through their research, the authors established rational parameters of apple juice processed by shungite under which the maximum reduction of microbial insemination is reached. The research proved that after apple juice interacts with shungite, its dry solids content and active acidity level remain unchanged. This paper confirmed high quality parameters of apple juice processed by shungite. Taking into account the obtained results, the authors concluded that use of shungite to process apple juice does not require expensive equipment, complex maintenance of the processing procedure, which reduce the cost value of a manufactured product. 展开更多
关键词 Apple juice shungite adsorptive processing MICROORGANISMS quality parameters.
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