试样以王水分解、泡塑富集分离金，硫脲解脱，以硝酸-硫酸破坏硫脲，用氟化氢胺- EDTA掩蔽铁、铜、铅等干扰元素，加碘化钾使之析出碘，以淀粉为指示剂，用硫代硫酸钠进行滴定。
Conceal disturbing elements like iron, copper, lead with hydrogen fluoride amine-EDTA, add the potassium iodide to separate iodine, and take starch as indicator, titrate with sodium hyposulfite.
以绿豆淀粉为原料，环氧丙烷为醚化剂，氢氧化钠为催化剂，无水硫酸钠为膨胀抑制剂，对羟丙基绿豆淀粉合成工艺及性能进行了研究。
Synthesis technology and property of hydroxypropyl starch by using potato starch as raw material, propylene oxide as etherization reagent and sodium hydroxide as catalyst, were studied in this paper.
以绿豆淀粉为原料，环氧丙烷为醚化剂，氢氧化钠为催化剂，无水硫酸钠为膨胀抑制剂，对羟丙基绿豆淀粉合成工艺及性能进行了研究。
Synthesis technology and property of hydroxypropyl starch by using potato starch as raw material, propylene oxide as etherization reagent and sodium hydroxide as catalyst, were studied in this paper.
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