The High Temperature Titration of Amorphous Silica

将开发一种新的和新颖的技术， 海洋沉积物中无定形二氧化硅的测定 是 基于无定形二氧化硅的高温滴定 根据反应添加碳酸钙：SiO2 + CaCO3 -CaSi1O3 + CO2。 拟议的研究将继续进行 沿着三条线：1.方法的进一步发展。 在500 ℃下进行了三个样品的初步热解实验 天 随后的工作是在700 oC下进行一小时。 这些新 条件需要重复许多实验， 确定最佳温度和时间， 矿物学、水含量等方面的反应， 最佳条件 2.海洋硅石的再评价 预算 初步工作表明，钙质软泥和 大陆架沉积物是更重要的汇， 以前相信。 3.产品CO2中18 O的使用 作为无定形二氧化硅和古海洋的18 O的量度 它是从那里被存放的。 //

A new and novel technique will be developed for the determination of amorphous silica in marine sediments. It is based on the high temperature titration of amorphous silica with added calcium carbonate according to the reaction: SiO2 + CaCO3 ----- CaSiiO3 + CO2. The proposed research will proceed along three lines: 1. Further development of the method. Preliminary pyrolysis experiments were done at 500oC for three days. Subsequent work was at 700oC for one hour. These new conditions necessitate the repetition of many experiments to determine the optimum temperature and time and the dependence of the reaction on mineralogy, water content etc. for the optimum conditions. 2. Revaluation of the marine silica budget. Preliminary work indicates that calcareous oozes and continental shelf sediments are much more important sinks than previously believed. 3. The use of the &18O of the product CO2 as a measure of the &18O of amorphous silica and the paleocean from which it was deposited. //