In fresh water lake, trace elements belonging to hard acid exist mainly as free ion.

在淡水湖泊中，属于硬酸的元素主要以游离离子存在。

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Uncertainty of evalution measurement of bromate in wheat flour by regent free ion chromatography method;

文章研究了离子色谱法测定铁矿石样品中水溶性氯化物。

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The paper introduced the up to date technology-reagent free ion chromatography (RFIC) and summarized several hot applications using ion chromatography.

本文对离子色谱技术的最新进展-只加水技术进行了总结，并对离子色谱几个最新的热点应用进行了介绍。

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That kind of performance is unheard of in today's plug-free chargers, which tend to be powered by conventional alkaline or lithium ion batteries and often can only last for one or two charges before needing replacement or recharging on their own.

BBC: Four ways to revive a dying mobile phone

With capacity of 17.6 kWh the lithium-ion battery from the joint venture with Evonik Industries provides for well over 140 kilometres of pollutant-free driving fun.

ENGADGET: Third generation Smart Fortwo ditches Tesla powertrain, gains two wheeled cousin