论文部分内容阅读
在食物中测出矿物碎屑,并不是一件困难的事,难的是要同时测出其性质。例如在食物中混有砂石,并无大害,但若混有玻璃屑,则服食者大有危险,甚至致命。苏联区立卫生细菌学研究室的氏发明了一个简单的测定方法。把食物反复筛过,在通过了最精细的筛,而仍不能发现玻璃屑时,可以采取约100克的篩馀物,仔细搅,混合,倾入容积约为300亳升的分液漏斗内,加入足量的氯仿,使食物全部漂浮在氯仿上面,再充分振荡,这时矿物屑便沉着於分液漏斗的底部。把这一分液漏斗底层的矿物屑,连同一部分氯仿(不可混有其他食物屑)再通过一次过滤。
Measuring mineral debris in food is not a difficult task, but the difficult thing is to measure its properties at the same time. For example, it is harmless to mix gravel in food, but if it is mixed with glass shavings, it is dangerous and even fatal for those who take it. The Soviet Union District Health Bacteriology Laboratory invented a simple method of determination. When the food is passed through the finest sieve and the glass crumb is still undetected, about 100 grams of sieve residue can be taken and carefully mixed and poured into a separatory funnel with a volume of about 300 ml , Add enough chloroform to float all the food on the chloroform and shake well again. At this moment, the mineral debris settles on the bottom of the separatory funnel. The bottom of the separatory funnel mineral debris, together with a portion of chloroform (not mixed with other food debris) and then through a filter.