著者

浅岡 聡 青野 求

出版者

一般社団法人 日本土壌肥料学会

雑誌

日本土壌肥料学雑誌 (ISSN:00290610)

巻号頁・発行日

vol.77, no.1, pp.33-39, 2006-02-05 (Released:2017-06-28)

参考文献数

31

被引用文献数

3

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The purpose of this study is to investigate utilization of Akadama soil and evaluate its ion removal efficiency for seawater desalination. The chemical composition of the Akadama soil was Al_2O_3 0.334kg kg^<-1>, SiO_2 0.470kg kg^<-1>, Fe_2O_3 15.7kg kg^<-1> by weight. X-ray powder diffraction pattern, electron diffraction pattern and IR spectrum of Akadama soil showed that allophane was the main phase and low crystallinity kaolin was generated from the allophane. The column method was carried out to evaluate seawater desalination efficiency, the best mixture ratio of the Akadama soil (particle size was less than 250μm), aluminum silicate adsorbent, aluminium magnesium adsorbent, and magnesium oxide adsorbent was 3:1:1:1. Removal percentages of Na^+, Mg^<2+>, Ca^<2+>, K^+ and Cl^- from artificial seawater were 87.7, 84.4, 91.1, 97.3 and 90.7%, respectively. In the batch method, where the mixed adsorbent was used for removal of heavy metals from 20mg L^<-1> solution, the removal percentages of Cu^<2+>, Ni^<2+>, Mn^<2+>, Zn^<2+>, Cd^<2+> and Pb^<2+> were higher than 98%. The removal percentage of PO_4, from river water was 100%.

著者

加野 直平 青野 求

出版者

日本海水学会

雑誌

日本海水学会誌 (ISSN:03694550)

巻号頁・発行日

vol.21, no.6, pp.230-234, 1968 (Released:2013-02-19)

参考文献数

6

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New procedure for the gravimetric determination of either phophorus or magnesium was proposed. In this procedure, the magnesium ammonium phosphate (MAP) is filtered on glass filter, and then in this state it is ignited to the magnesium pyrophosphate (MPP) at 570-590°C.In order to compare the new procedure with the ordinary gravimetric procedure, 10 samples of the MAP precipitated from a certain ammonium phosphate solution were adopted for each procedure, and the operation was examined from the beginning of the filtration of the MAP to the ending of the weighing of the MPP. Results were as follows.(1) Estimated value of the new procedure agrees with that of the ordinary.(2) Hours required for the two procedure are nearly equal, but actual working hours for the new procedure is 1/3 of that of the ordinary.(3) The standard deviations of the estimated value in the new procedure and the ordinary are 1.34 ppt and 1.68 ppt to the arithmetic mean, respectively.The new procedure offers much saving in time and tedium over the ordinary gravimetric procedure, and is more precise.