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家庭养花,偶尔会遇到需要准确称取微量(少量)溶质,配制溶液的问题。花数千元买分析天平吗?实在没必要。怎么办?笔者动了一下脑筋,又动了一下手,称取毫克的戥子,便造出来了。用料秤杆:选一根骨质筷子,用碎玻璃片把筷子适当刮圆刮细。秤杆粗端钻一个孔,悬挂秤盘。秤毫孔经试验初步定位(详见下文)后再钻孔,孔径均为0.1～0.2毫米。秤盘:选一个不锈钢汤匙(中号,本人用的重量约12.5克),去把后在近边缘处等距离开3个小孔。秤砣:用不锈钢汤匙把自制,重量1克左右(随秤盘重量而有变化)。线:细尼龙线、细琴弦、风筝线等。
Family flowers, and occasionally encountered the need to accurately weighed trace (a small amount) solute, preparation of the solution. Spend thousands of dollars to buy analytical balance? It is not necessary. What to do? I move about brains, and move a bit, said the milligram prickly heat will be made. Material scale pole: choose a bone chopsticks, broken glass with chopsticks appropriate scraping round scraping. Beam coarse end drilling a hole, hanging pan. Weighing millimeters by the pilot initial positioning (see below) and then drilling, the aperture is 0.1 ~ 0.2 mm. Weighing pan: Choose a stainless steel spoon (medium, I use the weight of about 12.5 grams), go to the near edge of the equidistant from the three holes. Scale 砣: stainless steel spoon to homemade, weighing about 1 g (with pan weight and have changed). Line: fine nylon line, thin strings, kite line and so on.