钙-5-Br-PADAP-Triton X-100显色反应的研究和应用

在 pH8 0～ 10 0范围内 ,有非离子表面活性剂TritonX 10 0存在下 ,钙与 5 Br PADAP生成 1∶1稳定的有色络合物 ,其最大吸收波长λmax=5 5 5nm ,ε =3 6 7× 10 4,钙量在 0～ 2 0 μg/2 5mL范围内符合比尔定律 方法灵敏 ,准确 ,快速 ,可用于测定球墨铸铁、合金钢中的微量钙     

正三辛胺萃取－分光光度法测定重油中的微量铜

以正三辛胺萃取分离干扰离子，采用Ｃｕ（Ⅱ）－５－Ｂｒ－ＰＡＤＡＰ－ＯＰ显色体系测定重油中的微量铜。考查了正三辛胺萃取分离干扰离子的条件和测定条件。表观摩尔吸收系数为１．０２×１０５Ｌ（ｍｏｌｃｍ）－１，合成样品回收率为１０１．１％，重油分析结果的相对标准偏差＜５．０％。     

Fe（Ⅲ）—5—Br—PADAP—Triton x—100—EGTA析相光度法测定痕量铁

研究了Fe(Ⅲ)-5-Br-PADAP-Triton x-100析相显色体系,建立了测定痕量铁的析相光度法。实验表明,在pH=9.0硼酸-氢氧化钠介质中,Fe(Ⅲ)-5-Br-PADAP-Triton x-100在95℃加热1h形成的配合物被Triton x-100相完全富集,配合物最大吸收波长为556nm,表观摩尔吸光系数为7.10×10~4L·mol~(-1)·cm~(-1),铁含量在0～3.6×1.5~(-5)mol·L~(-1)范围内符合比尔定律,以EGTA、乙二胺、亚氨基二乙酸为联合掩蔽剂,测定人发、面粉中的痕量铁,获得满意结果。     

5—Br—PADAP—乳化剂OP分光光度法测定电镀废水中微量锌

研究了在乳化剂ＯＰ存在下,利用５－Ｂｒ－ＰＡＤＡＰ测定电镀废水中微量锌的显色条件。实验表明,在Ｐ来７．５－１０．０硼酸－硼酸钠缓冲溶液中,锌与５－Ｂｒ－ＰＡＤＡＡＰ,乳化剂ＯＰ形成紫红色３元配合物,其λｍａｘ＝５５２ｎｍ,∑５５２＝１．３＊１０＾５Ｌ／ｍｏｌ ｃｍ配位比为１：２,在０－２５μｇ／５０ｍＬ服从朗伯－比一律。该方法应用于电镀废水微量锌的测定具有灵敏度高,准确度好,操作简便安全,快速的特     

煤矸石中痕量钍的光度法测定

研究了 2 (5 溴 2 吡啶偶氮 ) 5 二乙氨基苯酚 (5 Br PADAP)作为微量钍的显色剂。在pH 5 .0的HAc NaAc缓冲体系中和非离子OP乳化剂的存在下 ,5 Br PADAP和钍 (Ⅳ )的络合物在λmax=5 85nm处的表观摩尔吸光系数为 1.3 5× 10 5L·mol- 1 ·cm- 1 。钍 (Ⅳ )的质量浓度在 0～ 0 .5 0mg·L- 1 范围内符合比耳定律。钍的加标回收率在 98.5 %～ 10 3 .6%之间 ,结合PMBP萃取分离 ,可用于测定煤矸石中的微量钍     

Study of uranium adsorption using amidoximated polyacrylonitrile‐encapsulated macroporous beads

Polyacrylonitrile beads, containing the amidoximated polyacrylonitrile, were prepared for adsorption of uranium. The synthesized amidoximated polyacrylonitrile chelating beads were evaluated, for their ability to adsorb uranium from aqueous solution, at different temperatures and pH values. The kinetic measurement showed that about 120 min of equilibration time was enough, to remove saturation amount of uranium from the solution. The pseudo first‐order and pseudo second‐order equations were used to analyze the kinetic data, and the rate constants were determined. The equilibrium adsorption data were examined by the Langmuir, Freundlich, and Temkin isotherms. The data showed a better fit to the Langmuir isotherm. The loaded uranium could also be leached out from the beads, by treating with dilute acids. The uranium uptake capacity of the polymeric beads was found to be 3.5 mg/g of the swollen beads. Reusability of the beads was also established by multiple adsorption–desorption experiments. The pore volume and the surface area of the dried beads, measured by BET method, were found to be 1.93 cc/g and 320 m²/g, respectively. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Determination of Microamount of Scandium in Rare Earth

ＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＭｉｃｒｏａｍｏｕｎｔｏｆＳｃａｎｄｉｕｍｉｎＲａｒｅＥａｒｔｈＷｅｎＭｅｉｊｕａｎａｎｄＬｅｎｇＣｈｕｎｈｕａ（温美娟）（冷春华）ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ,ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃｅａｎｄ...     

导数分光光度法测定铝及铝合金中微量锰的研究

研究了利用 5 Br PADAP作显色剂 ,乳化剂OP作增溶增敏剂 ,导数分光光度法测定铝及铝合金中微量锰的适宜条件。经对纯铝及铝合金国家标准样品进行分析 ,相对标准偏差RSD≤ 1 2 % (0.0 0 0 4 %Mn) ,标准加入回收率在 97%～ 1 0 3%之间。     

正三辛胺萃取－分光光度法测定重油中的镍

用正三辛胺萃取分离干扰离子，以Ｎｉ（Ⅱ）－５－Ｂｒ－ＰＡＤＡＰ－ＴｒｉｔｏｎＸ－１００显色体系测定重油中的镍。合成样品回收率为９９．７％，加标回收率为９９．８％，油样分析结果相对标准偏差＜０．７％。该方法准确、灵敏、简便、快速