硒粉（Selenium），化学式Se，黑灰色非金属，溶于浓硫酸、三氯甲烷，微溶于二硫化碳，有毒，不溶于水、乙醇。 硒粉通常呈粉状或颗粒状，外观纯净，颜色一致，纯度可达99.99%，无泥土等杂质，成分稳定，水分均匀。
所述硒源为含硒化合物与还原剂组成的体系，或者为金属硒粉。
The selenium source is mixture system comprising selenide and reductant or metal selenium powder.
这也帮我们节省大量在纸张和硒粉上的花费——所有的讲义都是电子稿，它们都是彩色的，多媒体的。
This would also save a lot of money currently spent on paper and toner - all hand-outs would be electronic, in colour, and multi-media capable.
含铁、含锌与含硒的麦芽粉要分别按比例加入面包，面包中有机态的铁、锌、硒含量均大大提高。
In addition, the amount of Iron and Zinc and Selenium in bread is increased greatly by proper addition of the wheat malt powder.
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