Principle and operation technology of removing silicon,phosphorous and arsenic from sodium wolframate is presented.
阐述了钨酸钠溶液中除硅、磷、砷原理,并提出了操作工艺。
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They will also look at the chemistry of elements other than carbon and oxygen—particularly nitrogen and phosphorous, which are essential to life, and sulphur, which often indicates the absence of oxygen and is thus antithetical to much animal life.
他们不单单只是观氧和碳元素,尤其是生命必须氮和磷,以及经常指示缺少氧且和大部分动物生命对立硫。