Study on Adsorption Behavior of Rare Earth Complexes on Nanometer-Size Titanium Dioxide with ICP-AES

Inrecentyears ,rareearthelements (REEs)havebeenwidelyusedinfunctionalmaterials ,cata lystsandotherproductsinindustry ,diagnosisreagentsofmagneticresonanceimaging (MRI)inmedicineandsomefertilizersinagricultureespeciallyinChina .However,asaresultoftheirusage ,moreandmoreREEsaregettingintotheenvironment,andalsointohumanbodyviafoodchain[1,2 ] .Itisnotclearwhetherrareearthelementsareessentialforman ,soitisveryurgenttostudythebiologicaleffectofrareearthelementsinhumanhealthandenvironment .Inthes…     

Study of Direct Determination of Trace Lanthanum in Biological Samples by ICP－AES Combined with Fluo

ＳｔｕｄｙｏｆＤｉｒｅｃｔＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＴｒａｃｅＬａｎｔｈａｎｕｍｉｎＢｉｏｌｏｇｉｃａｌＳａｍｐｌｅｓｂｙＩＣＰ－ＡＥＳＣｏｍｂｉｎｅｄｗｉｔｈＦｌｕｏｒｉｎａｔｉｏｎＥｌｅｃｔｒｏｔｈｅｒｍａｌＶａｐｏｒｉｚａｔｉｏｎＴｅｃｈｎ...     

转炉冶炼高碳钢工艺

针对转炉冶炼高碳钢存在的炉底波动较大、低脱磷率、难以控制喷溅等问题,从控制留渣量、对供氧和底吹气体的强度进行调整、控制回磷和终点控制这四方面对转炉冶炼高碳钢工艺进行优化,确保了留渣的数量,杜绝了过氧化渣的存在,从而实现了既留碳又脱磷的双重目标,及时把控了化渣现象和回磷现象,极大地提高了转炉冶炼高碳钢的合格率和通过率。     

CT及X线在股骨头坏死分期诊断中的价值评价

目的:评价CT及X线在股骨头坏死分期中的诊断准确性及价值。方法:收集我院2016年6月-2018年6月收治的46例确诊为股骨头坏死患者的影像资料,所有患者均进行CT及X线检查,行CT检查的为CT组,行X线检查的为X线组。比较两组患者股骨头坏死的阳性检出率及0期、I期、II期、III期、IV期分期诊断检出率。结果:CT组患者的阳性检出率(82.6%)显著高于X线组(63.0%),二者差异有统计学意义(Χ2=4.449,P0.05);且CT组患者在0期、I期、II期股骨头坏死检出率高于X线组(均P0.05),而在III期、IV期的检出率,二者差异无统计学意义(均P0.05)。结论:CT对股骨头坏死的检出率较X线高,且在股骨头坏死的早期诊断中较占优势。     

牵引负荷实测数据的分类

随着电气化铁路在铁路运输中的迅猛发展以及电压等级的不断提高,电气化铁路牵引负荷对电网的负序和谐波影响也随之增大。为了建立准确有效的电气化铁路牵引负荷模型以评估其对电网的影响程度,本文根据全国部分牵引变电所的实测数据,利用Matlab仿真软件对实测数据进行分析处理,得到其概率密度函数图以及对应的累积分布函数图。通过观察发现累积分布函数图之间存在一定规律,因此根据累积分布函数图,对牵引负荷实测数据进行分类整理,得到牵引负荷实测数据的分类。     

Direct Determination of Trace Titanium in High Purity Yttrium Oxide by FETV/ICP-AES

ＤｉｒｅｃｔＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＴｒａｃｅＴｉｔａｎｉｕｍｉｎＨｉｇｈＰｕｒｉｔｙＹｔｒｉｕｍＯｘｉｄｅｂｙＦＥＴＶ／ＩＣＰＡＥＳＰｅｎｇＴｉａｎｙｏｕ（彭天右），ＱｉｎＹｏｎｇｃｈａｏ（秦永超），ＦａｎＺｉｙｕ（范子瑜）ＪｉａｎｇＺｕ...     

Determination of Trace Metal Impurities in Cerium Oxide by Fluorination-Assisted ETV-ICP-AES after HPLC Separation

A new method for the separation and detection of trace metal impurities in cerium oxide (CeO2) using HPLC combined with electrothermal vaporization (ETV)-ICP-AES was developed. This combination links the high separation power of HPLC and high sensitivity of ETV-ICP-AES. The 2-ethylhexyl hydrogen 2-ethylhexylphosphate (P507) resin was used as stationary phase for the separation of metallic impurities in order to eliminate severe spectral interferences of the matrix. The dilute nitric acid was adopted as mobile phase for eluting Cu, Mn, Ni and La. The separation process can be accomplished in about 30 min. After concentrating the eluate by evaporation, the trace impurities were determined by using ETV-ICP-AES with the addition of 6% PTFE slurry as chemical modifier. The proposed method was applied to the analysis of CeO2 with satisfactory recoveries.     

邻氯苯基荧光酮—溴化十六烷基吡啶分光光度法测定微量镍

光度法测定镍,常用的是丁二酮肟法,但是,该法灵敏度较低,不能很好满足测定微量镍的要求,我们发现新显色剂邻 氯苯基荧光酮(o—ClPF)在溴化十六烷基吡啶(CPB)存在下,能与镍形成稳定的三元络合物,其摩尔吸光系数ε高达1.47×10~5,