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산성주석도금욕중에서의 C - Dip package 상의 Tin - bridge 형성기구와 그의 억제법 ( 2 )
이완구,남완우 한국부식학회 1981 Corrosion Science and Technology Vol.10 No.1
酸性光澤 주석 鍍金시 C-Dip package에 사용된 PbO-ZnO-B₂O₃系 solder glass 表面上의 Tin-bridge 形成機構를 說明코저 하였다. 豫備處理用 酸溶液에 의해서 形成된 solder glass 表面의 反應生成物이 陰極還元을 하므로서 Tin-bridge가 形成함을 알았으며 '또한 이 Tin-bridge를 形成할 수 있는 鍍金溶 條件을 변경시키므로서 Tin-bridge 形成의 內容을 說明할 수 있다. solder glass의 特性을 검토하므로서 과산화수소 용액에 의한 Tin-bridge 形成을 抑制할 수 있다. We investigate the mechanism of a tin-bridge formation on the solder glass surface during acid bright tin plating of a C-Dip package. In the PbO-ZnO-B₂O₃ system under study, the formation is found to be primarily due to the cathodic reduction the glass surface. And these sulfates, mainly PbSO₄, are shown to be the products of a precleaning with acids. The bath conditions are varied to see their effect on the tinbridge formation. We find that the formation can be avoided by pretreating the glass surface with oxyful. Possible mechanisms for this are discussed.
황새의 각 장기조직중 청산염과 금속류의 분포 및 정량에 관한 연구
이완구,박상균,박성우 한국환경보건학회 1983 한국환경보건학회지 Vol.9 No.2
An experimental study was carried out to determine the degree of contamination of cyanide and metals in each stork s (Ciconia c. boyciana) organ. The samples used for this experiment were gullet, respiratory tract, stomach content, rectum, lung, liver, heart, pancreas, gall, kidney, and muscles. Those samples were isolated by Conway microdiffusion method and determined by UV spectrophotometry for the cyanide, on the other hand, the samples for metals were dissolved by mercury digestion apparatus and analyzed by atomic absorption spectrophotometry. The results are as follows: 1) The quantities of cyanide accumulated in each organ were from 0.05 to 2.57 ppm and concentration of those in tissues was in order of 2.57 ppm in stomach content, 2.13 ppm in lung, 1.58 ppm in kidney, 1.22 ppm in gall, 0.52 ppm in pancreas, 0.32 ppm in heart, 0.25 ppm in rectum, 0.20 ppm in gullet, 0.19 ppm in liver, 0.07 ppm in muscles and 0.05 ppm in respiratory tract. 2) The calcium content is in a range of 10.89-105.74 ppm, iron is 2.47-557.70 ppm, zinc is 2.37-23.62 ppm, cupper is < 0.1- 1.76 ppm and cadmium, nickel, cobalt and lead is beyond 0.5 ppm, respectively.