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4-(6′-溴苯并噻唑偶氮)-3-羟基苯甲酸[4-(6′-bromobenzothiazolylazo)-3-hydroxyben-zoic Acid,Br-BTAHA]是 Cu~(2+)、CO~(2+)、Ni~(2+)的很好的显色剂和酸碱指示剂。用 Br-BTAHA 和 Cu-Br-BTAHA 作指示剂,以 EDTA 分别滴定 Cu~(2+)、Co~(2+)、Ni~(2+)及 Co~(2+)、Ni~(2+)、Zn~(2+)、Cd~(2+)、Pb~(2+),终点由蓝色分别突变为绿(或橙)色及黄绿(或橙红)色,十分清晰敏锐。根据 Ringbom 误差公式计算,Br-BTAHA 完全具备配位滴定指示剂的各项必要条件,是一种选择性和准确度均好的指示剂。 相似文献
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某矿区微量放射性原水的处理 总被引:3,自引:0,他引:3
某矿区原水中总α放射性水平超过了国家饮用水标准 (GB 5 74 9— 85 )规定的 3倍左右 ,严重威胁人体健康。为此选择混凝沉淀法处理的结果表明 ,采用净水剂和助凝剂处理后水质达标、效果稳定。该技术已应用于处理规模为 10× 10 4 m3/d的水厂 ,运行状况良好 相似文献
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The nickel nanoparticles with different sizes and spherical shape were prepared by the reduction of nickel sulfate with sodium borohydride in the water-in-oil emulsions of water/SDBS(sodium dodecylbenzene sulfonate)/n-pentanol/n-heptane. The effects of aging time, molar ratio of water to SDBS(R) and the concentration of nickel sulfate on the size of particles were studied. The samples were characterized by transmission electron microscopy(TEM) and inductively coupled plasma spectrometry(ICP). The results show that the average particle size changes from 20 to 40 nm by adjusting aging time (15-30 min) and R (9-11.5). The concentration of nickel sulfate of 1.0 mol/L is the favorite condition. 相似文献
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