题目

英语翻译
Samples were then dried in an oven
at 110?
C,sifted through a 2-mm sieve to remove extraneous
materials,and retained for further analysis.Two grams of the
sample were accurately weighed and digested for total heavy
metal analysis using the wet digestion procedure.The sample
was transferred to a polyethylene test tube and digested with
15 mL of a 1:1 mixture of nitric acid (HNO3):perchloric acid
(HClO4).The mixture was heated at 80?
C for 2–3 hours us-
ing a heating block.The contents were ltrated and transferred
through a simple ltration apparatus into a 25-mL polyethy-
lene volumetric ask.The lter paper was washed several times
with 1% HNO3,and the volume was completed to 25 mL with
1% HNO3.The solutions were stored in sealed plastic bottles
prior to analysis.The heavy metals (Pb,Cu,Zn,Ni,Fe,Al,Cr,
Co,Cd,Mo,and Mn) were determined in dust samples using
aPerkin Elmer Flame Atomic Absorption Spectrophotometer提问时间：2020-08-07

答案

样本,然后干燥炉在 110 吗?通过删除多余 2 毫米筛子仔细的 C材料,并保留作进一步分析. 两克,示例是准确地衡量和消化的总重金属分析使用湿的消化过程. 该示例被转移到一个聚乙烯试管,与消化15 毫升的氮酸 (HNO3) 1： ...