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1.
研究结果表明,在混合表面活性剂CTMAB-吐温-60存在下的pH5.7~6.5的缓冲介质中,Sc(Ⅲ)与4,5-二溴苯基荧光酮(DBPF)形成高灵敏的多元配合物,其ε_(590)=2.26×10 ̄5L·mol ̄(-1)·cm ̄(-1),组成比为:Sc:DBPF:CTMAB=1:2:4。采用混合表面活性剂使增溶增敏作用更为显著,并加速了显色反应,增强了配合物的稳定性。而Na_2SO_4的加入能显著地提高体系的灵敏度。Sc量在0~0.36ug/ml范围内遵守比尔定律。方法可直接测定合成混合稀土中的Sc,回收率在98%~105%;结合沉淀分离和PMBP萃取分离,实现了地质试样中痕量Sc的测定。  相似文献   

2.
Fe-对硝基苯基荧光酮-CTMAB在pH10.0-11.2的硼砂-NaOH缓冲溶液中形成蓝色多元配合物,其组成为Fe:p-NPF:CTMAB=1:2:4。在吐温-60下,λmax为160nm,ε610=1.12×10^5L.mol^-1.cm^-1,Fe含量在0-0.2μg/ml范围内符合比耳定律。  相似文献   

3.
3,5—二溴—4—偶氮变色酸苯荧光酮与铝显色反应及应用   总被引:6,自引:0,他引:6  
黄应平  张华山 《岩矿测试》1997,16(4):293-295
研究了在阳离子表面活性剂CTMAB存在下,Al与3,5-二溴-4-偶氮变色酸苯基荧光酮的是色反应条件和光变性质。在pH6.0的HAc-NaAc缓冲介质中,Al与试剂形成1:2的红色配合物,最大吸收峰位于560nm处,表观摩尔吸光系数为1.25×10^4L.mol^-1.cm^-1,Al的质量浓度为0-0.2mg/L时符合比尔定律。  相似文献   

4.
研究了新合成的meso-四(2-磺酸萘基)卟啉(TNPS4)与Mn^2+的显色反应。在pH8.0的Na2B4O7-HCl缓冲溶液中,TNPS4与Mn^2+形成稳定的配合物,最大吸收波长470nm,配合物组成为TNPS4:Mn^2+=2:1,表观摩尔吸光系数ε=1.03×10^5L·mol^-1·cm^-1,线性范围0.0-5.0μgMn^2+/25ml。用于化探样品中Mn的测定,结果令人满意。  相似文献   

5.
研究了Ag(I)与meso-四(对-磺酸基苯基)叶琳的光催化显色反应。在pHl0的缓冲溶液中形成稳定的Ag(I)-TPPS_4-CTMAB三元配合物,其最大吸收波长为426nm,组成为Ag(1)TPPS_4:CTMAB=1:1:2。表观摩尔吸光系数为2.79×l0 ̄5L·mol ̄-1·cm ̄-1,Ag(1)的浓度在0~0.2μg/ml内符合比尔定律。基于此建立的测Ag(I)方法灵敏度高,结合巯基棉分离干扰,可用于矿物中Ag(I)的测定。  相似文献   

6.
罗宗铭  钟卓荣 《岩矿测试》1994,13(3):189-193
在PH2.5的氯乙酸缓冲介质中,有溴化十六烷基三甲基胺存在下,Mo与氨三乙酸及溴邻苯三酚红形成胶束混配配合物,该配合物最大吸收波长在600nm,摩尔吸光系数为7.27×10^4L.mol^-1.cm^-1,配合物组成为Mo(Ⅵ):NTA:BPR:CTMAB=1:1:2:4。Mo(Ⅵ)量在0-1.0μg/ml范围内符合比尔定律。由于NTA的存在,改善了方法的选择性,可直接分光光度测定矿石及钢中微量M  相似文献   

7.
在pH2.5的氯乙酸缓冲介质中,有溴化十六烷基三甲基铵(CTMAB)存在下,Mo(Ⅵ)与氨三乙酸(NTA)及溴邻苯三酚红(BPR)形成胶束混配配合物,该配合物最大吸收波长在600nm,摩尔吸光系数为7.27×10 ̄4L·mol ̄(-1)·cm ̄(-1),配合物组成为Mo(Ⅵ):NTA:BPR:CTMAB=1:1:2:4。Mo(Ⅵ)量在0~1.0g/ml范围内符合比尔定律。由于NTA的存在,改善了方法的选择性,可直接分光光度测定矿石及钢中微量Mo。  相似文献   

8.
新型卟啉显色剂TDMAPTPS与钯的显色反应研究   总被引:4,自引:0,他引:4  
研究了新型水溶性卟啉显色剂TDMAPTPS与钯的显色反应,在pH为3.4~5.0缓冲溶液中,适量VC,OP,SDBS存在,Pd(Ⅱ)与显色剂形成1:1稳定配合物,λmax=413nm,ε=1.65×10^5L.mol^-1.cm,Pd(Ⅱ)浓度在0~3.2μg/10mL之间服比尔定律。该方法用于实际样品测定,结果满意。  相似文献   

9.
常温下在pH4的HAc-NaAc缓冲体系中,Ga与1,5-二(2-羟基-5-磺基苯基)-3-氰基甲 (DSPCF)形成稳定的蓝色配合物。该配合物在波长630nm处有最大吸收,其表观摩尔吸光系数为3.8×10 ̄4L·mol ̄-1·cm ̄-1,配合比为n(Ga):n(DSPCF)=1:2,显色反应在20min内完成,稳定时间至少24h,Ga量在0~1.8mg/L时遵守比尔定律。采用TBP萃淋树脂分离干扰元素后可实现煤矸石中Ga的测定。  相似文献   

10.
罗宗铭  彭少锋 《岩矿测试》1996,15(3):213-216
在pH5.6-6.4的缓冲介质中,Sc-埃铬菁R(ECR)-氯化十六烷基吡啶-乳化剂OP形成蓝色配合物,基组成比nsc:nECR:nCPC=1:2:2。配合物的最大吸收长在610nm处,表观摩尔吸光系数为1.71×10^5L.mol^-1.cm^-1。  相似文献   

11.
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.  相似文献   

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14.
正1 Introduction Geological studies established on several sections in Lanping-Simao basin have shown that the salt-bearing strata of Mengyejing formation(Yunlong Fm.in Lanping basin)are constituted by an alternation of salt layers and interbedded facies.The latter consists mainly of mudstones,and mudstone-rich conglomerate.The mineralogy and geochemistry of salt-bearing beds and  相似文献   

15.
正On 22nd April 2014,with the approach of the 45th World Earth Day,China’s Ministry of Land and resources issued the status of China’s mineral resources in 2013.The first task of the prospecting breakthrough strategy action implemented in the last five years has been completed,and China’s security capacity for mineral resources has been significantly improved.In the  相似文献   

16.
正There are more than 700 salt lakes with area of more than 1km2 on the Qinghai-Tibet Plateau of China.In recent years,an oilfield brine was also found in the Nanyishan Section of Qaidam Basin in the Qinghai-Tibet  相似文献   

17.
正1 Introduction Physical and numerical models are constructed to investigate the evolution and mechanism of salt migration driven by tectonic processes.In recent years,we have designed and ran series of models to simulate salt  相似文献   

18.
正The study of Cretaceous-Palaeogene salt-bearing strata of the Khorat Basin Laos and the Lanping-Simao Basin in Yunnan,China has an great significance not only in explaining the basin evolution and the genesis of potash  相似文献   

19.
正Potash is one of the long-term scare deposits in China,and potash prospecting has long been listed as a key brainstorm project for our nation and geological prospecting units.There have been considerable studies in search for potash deposits in the Kuqa depression of the Tarim basin(Jackson et al.,1991;Gemmer et al.,2004;Vendeville,2005;Vendeville and Jackson,1992a,1992b),  相似文献   

20.
正1 Introduction Qaidam Basin in Qinghai,including 43 salt lakes with multiple dominant mineral such as potassium,magnesium,lithium etc.,is the most intensive distribution of Saline  相似文献   

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