共查询到20条相似文献,搜索用时 163 毫秒
1.
利用二氯乙烷萃取邻二氮菲-铁(Ⅱ)-苦味酸盐三元配合物,可以藉分光光度法测定钛氧化物中的微量铁,表观摩尔吸光系数达1.22×105。方法灵敏、干扰少,已用于高纯钛氧化物中微量铁的测定。 相似文献
2.
高纯钛氧化物中微量铁的萃取分光光度测定 总被引:2,自引:0,他引:2
利用二氯乙烷萃取邻二氮菲-铁(Ⅱ)-苦味酸盐三元配合物,可以藉分光光度法测定钛氧化物中的微量铁,表观摩尔吸光系数为1.22×10^5。方法灵敏,干扰少,已用于高纯钛氧化物中微量铁的测定。 相似文献
3.
利用在醋酸-醋酸钠缓冲溶液(Ph4.6)中Fe^2 与1,10-邻二氮菲-苦味酸盐形成橙红色配合物的显色反应,建立了一种新的测定人发中痕量铁的分光光度法,用于正常人及患者头发中的痕量铁分析。 相似文献
4.
研究了邻二氮菲分光光度法测定土壤中铁的方法,探讨了方法的最佳条件。结果表明,以邻二氮菲为显色剂,可于510nm处测定土壤中铁的含量,铁含量在0~4mg/L范围内服从比尔定律,线性回归方程为y=0.377x+0.0022,相关系数γ=0.9989,表观摩尔吸光系数 相似文献
5.
研究了在配体邻二氮菲及氟脲嘧啶存在下,直接用EDTA容量法测定稀土硝酸盐—邻二氮菲—氟脲嘧啶配合物([Ln(Phen)2(Fu(NO3)](NO3)2)(Ln=稀土元素)[1],终点颜色变化敏锐,结果准确。 相似文献
6.
利用在醋酸 -醋酸钠缓冲溶液 (pH4.6)中Fe2 +与 1,10 -邻二氮菲 -苦味酸盐形成橙红色配合物的显色反应 ,建立了一种新的测定人发中痕量铁的分光光度法 ,用于正常人及患者头发中的痕量铁分析。 相似文献
7.
通过实验建立了以邻二氮菲法,测定脱碳溶液中总铁的方法,该法与磺基水杨酸法比较,具有准确度高,络合物十分稳定,易消除干扰等特点,该法标准偏差S=0·15,相对误差E=0·34%,运用于实际生产中脱碳溶液总铁的测定,得到了满意的结果。 相似文献
8.
9.
建立了以邻二氮菲测定人发样中的微量铁的分光光度法。研究表明,在pH=2~9的溶液中,铁(Ⅲ)可用盐酸羟胺还原至铁(Ⅱ),生成的铁(Ⅱ)可与邻二氮菲生成稳定的橘红色络合物,其最大吸收波长为506 nm,铁浓度在0.31~16.00 mg/L范围内与溶液吸光度呈良好线性关系,线性回归方程为A=0.20192ρ-0.01164(mg/L),相关系数r=0.9999,检出限为0.157 mg/L,相对标准偏差(RSD)为0.58%,表观摩尔吸收系数ε=3.59×104L.(mol-1cm-1)。 相似文献
10.
邻二氮菲分光光度法测定金属锑中铁含量 总被引:1,自引:0,他引:1
用王水溶解金属锑 ,以酒石酸钾钠为络合剂 ,盐酸羟胺为还原剂 ,在波长 5 1 0nm处以邻二氮菲分光光度法测定铁的含量。此方法准确度较高 相似文献
11.
铁(Ⅱ)-邻菲罗啉-BPR体系分光光度法测定果蔬中的维生素C 总被引:9,自引:0,他引:9
在pH6.0的乙酸-乙酸钠缓冲溶液体系中,有CTMAB存在下,维生素C将铁(Ⅲ)-邻菲罗啉还原,还原产物与溴邻苯三酚红(BPR)形成铁(Ⅱ)-邻菲罗啉-BPR缔合物,其λmax=580nm,ε=1.09×105L·mol-1·cm-1,维生素C含量在0~70μg·25mL-1范围内服从比耳定律。此法用于测定新鲜果蔬中的维生素C获得较满意的结果 相似文献
12.
13.
Transparent polymers when incorporated with strongly fluorescent europium chelates were found to be responding to excitation with UV radiation. In this work, two novel europium chelates have been synthesized using the β‐diketones dimedone and phenylazo dimedone along with 1,10‐phenanthroline. These chelates were characterized by elemental analyses, magnetic susceptibility measurements, UV, IR, and ESI mass spectral techniques. The chelates synthesized with metal : β‐diketone : 1,10‐phenanthroline ratio 1 : 3 : 1 were incorporated into polymer matrices. Four polymers, polyethylene vinyl acetate or acetate (EVA), polystyrene (PS), poly methyl methacryalate (PMMA), and polyethylene glycol (PEG) were used for the studies. All these, except the liquid oligomer PEG were cast into thin films. PEG was used as such for the studies. The photoluminescence spectra of the plain polymers were found to be having peaks very close to the absorption peaks of the polymers doped with europium chelate. This observation can be used in optical devices. Thermal analyses like TG/DTG/DTA of the polymer films were conducted to ascertain the thermal stability of the material. The SEM analyses of the films indicated a smooth surface with uniform distribution of the doped chelate. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
14.
15.
依据工业硝酸铵产品的性质及邻菲啰啉分光光度法测定尿素中铁离子含量的原理,确立工业硝酸铵中铁离子含量的测定方法,并对分析条件进行研究。结果表明,选用分光光度法测定工业硝酸铵中铁离子含量时,最大吸收波长为510 nm,邻菲啰啉作显色剂,显色时间为10 min,称取的样品铁质量为0.03~0.06 mg。该方法操作简便,相对标准偏差为0.56%~1.04%,加标回收率在95.0%~103.7%,分析结果准确,精密度好,可用于工业硝酸铵产品中铁离子的测定。 相似文献
16.
《Inorganic chemistry communications》2007,10(2):195-198
A phenanthroline derivative, which has an aniline group, was synthesized by palladium catalyzed Suzuki cross coupling reactions. The aryl phosphine ligand, PPh3, showed higher activity than the alkyl phosphines, P(tBu)3 and PCy3, in the Suzuki couplings and provided the coupled product, 4-phenyl-7-(4′-amino-biphenyl-4-yl)-[1,10]phenanthroline (5), with 73% yield. Its ruthenium complex, bis(4,7-diphenyl-[1,10]phenanthroline){4-phenyl-7-(4′-amino-biphenyl-4-yl)-[1,10]phenanthroline} ruthenium(II) bis(hexafluorophosphate) (8), was synthesized under mild conditions. This complex showed a linear fluorescence intensity response between pH 3.5 and pH 8.5. 相似文献
17.
合成了二种含二环己酮草酰二腙桥的双核钴配合物 [Co2 ( BCO) ( Mephen) 4]( Cl O4 ) 4( 1 )和[Co2 ( BCO) ( Me2 phen) 4]( Cl O4 ) 4( 2 )。BCO=二环己酮草酰二腙 ,Mephen=5-甲基 - 1 ,1 0 -邻菲咯啉 ,Me2 phen=2 ,9-二甲基 - 1 ,1 0 -邻菲咯啉。使用元素分析、摩尔电导以及红外光谱和电子光谱手段对配合物进行了表征 ,推定了配合物的组成和结构。并用循环伏安法研究了配合物 [Co2 ( BCO)( Mephen) 4]( Cl O4 ) 4的电化学行为 相似文献
18.
聚乙二醇相转移催化合成1-硝基蒽醌 总被引:2,自引:2,他引:2
在乙腈、相转移催化剂聚乙二醇存在下 ,蒽酮与硝酸铈铵反应生成 1 -硝基蒽醌。聚乙二醇作为相转移催化剂可以提高反应的选择性。结果表明最佳反应条件为 :蒽酮与硝酸铈铵的物质的量比为 1∶ 1 .4,反应温度 5 0°C,反应时间 1 .6h。产率达 73 .2 %。 相似文献
19.
Irradiated tellurium targets were purified by precipitation from 6 M HCl solution using 1,10-phenanthroline. The effect of molar ratio of the reactants (initial 1,10-phenanthroline:Te molar ratio) on the precipitation yield of radiotellurium was studied. It was found that, >99% of radiotellurium has been taken up by the precipitate formed with the initial 2 phenanthroline:1Te molar ratio along with different decontamination ratios from the other cross-radiocontaminants; ≥99.9% of 65Zn, 97.7 ± 1.2% of 75Se, ≥99.9% 110mAg, and 95.4 ± 2.5% of 124Sb. Traces of 51Cr, 54Mn, 59Fe, and 60Co have been detected only in the supernatant after the precipitation process. Un-irradiated tellurium was precipitated with 1,10-phenanthroline under the same conditions with the initial 2phenanthroline:1Te molar ratio and, then, the precipitate formed was characterized by IR spectroscopy and thermal analysis. The most probable chemical composition of this precipitate was [Te(phen)2Cl4]·3.4H2O. 相似文献