英 na.痕量[微量]元素 网络微量元素 复数:trace elements 权威英汉双解 英汉 英英 网络释义 trace-element n. 1. 痕量元素a chemical substance that is found in very small amounts 2. 微量元素(生物,尤指植物,生长所需要的微量的化学物质)a chemical substance that living things, especially plants, need ...
复数:trace elements; 实用场景例句 全部 微量元素 Rats in the two groups receivedtrace elementsupplementation. 术后,微量元素行二组灌胃. 期刊摘选 Selenium is an essentialtrace elementand exists in the body in the forms of selenoprotein. 硒是生物体必需的一种微量元素,主要以含硒蛋白质的形式存在于生物...
0-n: Optional element that can occur more than once. 展开表 备注 The corresponding element in the Analysis Management Objects (AMO) object model isTrace. 请参阅 参考 Server Element (ASSL) Objects (ASSL) 帮助和信息 获取SQL Server 2005 帮助...
These observations indicate decoupling of REE+Y behavior from fluid mobile elements such as Sr or O. SEM work is helpful in the identification of homogeneous carbonate domains, but it does not guarantee that such domains have retained pristine compositions. [1] Huang et al. (2009) Chinese ...
Trace elemental screening and speciation analysis of food is receiving global attention. Some elements are an essential part of a healthy diet, but others, such as lead, mercury, arsenic and cadmium, offer no nutritional benefits to humans a...
Trace Elements Definition On Earth a trace element is an element present in low concentrations in rocks, waters, or biological materials. A concentration of 100 parts per million (ppm) is commonly accepted as an upper limit. In geochemistry, trace elements are distinguished from major elements. ...
The concentrations of 26 trace elements have been determined for zircons from a wide range of different rock types and reveal distinctive elemental abundances and chondrite-normalised trace element patterns for specific rock types. There is a general trend of increasing trace element abundance in ...
Moreover, the examination of other elements that behave like the ore elements is often informative. The purpose of this paper is to review the application of trace element systematics to understanding the types and origins of ore-related silicic magma. This is a highly selective review intended ...
This 24-chapter book issues authoritative recommendations concerning nutritional requirement and safe ranges of intake for 19 trace elements (iodine, zinc, selenium, copper, molybdenum, chromium, manganese, silicon, nickel, boron, vanadium, fluorine, lead, cadmium, mercury, arsenic, aluminium, lithium ...
A new glass-making method was developed to allow thein situanalysis of trace elements and lead isotopes in rock samples. The apparatus used to prepare homogeneous glass samples from silicate rock powder consisted of a small (450 mm3) boron nitride vessel and a high-temperature furnace. The conce...