Square wave stripping voltammetry (SWASV) was a high sensitivity electrochemical methods to detect the trace metal ions.

方波溶出伏安法(SWASV)是测定痕量金属离子的一种高灵敏度的电化学方法。

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It is an efficient path to enhance anaerobic digestion by adjusting nutritive proportion and adding trace metal ions.

可见，在厌氧消化系统中调节营养比例、添加微量金属元素是提高厌氧消化效率的有效途径。

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From the chemical composition, trace element, inoculation and thermal exchange of metal mold casting, the principle of chill formation and the effective methods for preventing chill were studied.

文章从铸铁的化学成分、微量元素、孕育处理及金属型的热交换方面叙述了产生白口的原理及防白口的有效方法。

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The authorities are now looking for anything that might have been part of the explosive devices - bits of metal or sharp objects that they might be able to trace back to its owner or owners.

BBC: Forensics investigators decode the Boston bombings