稀土—偶氮胂Ⅲ配合吸附波法测定稀土元素

在ｐＨ值为３的ＮＨ３．Ｈ２Ｏ－ＮＨ４Ｃｌ介质中,镧,铈,镨与偶氮胂Ⅲ（ＡＳＡⅢ）形成配合物,并于－０．７１Ｖ（ｖｓ．ＳＣＥ）处产生灵敏的配合物吸附波峰电流与镧,铈,镨浓度分别为３．６×１０＾－８～１．４×１０＾－６ｍｏｌ／Ｌ,１．８×１０＾－８～８．６×１０＾－７ｍｏｌ／Ｌ,３．５×１０＾－８～７．０×１０＾－７ｍｏｌ／Ｌ范围内呈线性关系,测得镧与偶氮胂Ⅲ的配合比为１：１。稳定常数为４．５×１０＾     

磷矿石中微量砷测定的新方法

研究测定磷矿石中微量砷的新方法,以硝酸银—乙酸—聚乙烯醇（ＰＶＡ）—乙醇作为砷化氢吸收液,Ｚｎ－ＫＩ－ＳｎＣｌ２为还原体系的新银盐光度法测定砷。Ａｓ３＋质量浓度在０～７．５μｇ／５ｍｌ范围内服从Ｂｅｅｒ定律。方法回收率为９６％～１００．５％,分析含砷１．６０×１０－３％,ＲＳＤ为１．２３％,方法检出限为１．９×１０－６ｇ／Ｌ。     

分光光度法测定盐酸环丙沙星

研究了０．１ｍｏｌ·Ｌ－１的硫酸介质中,盐酸环丙沙星与三氯化铁的显色反应。盐酸环丙沙星浓度在３．３×１０－５～７．３×１０－４ｍｏｌ·Ｌ－１（０．０１２～０．２７ｍｇ·Ｌ－１）范围内符合比尔定律,ε＝１．８５×１０３Ｌ·（ｍｏｌ·ｃｍ）－１。测得络合物组成比为１∶１。本方法简便准确,可用于片剂和胶囊中盐酸环丙沙星的测定。     

测定亚硝胺的电位型霉变玉米胚组织传感器研究

利用霉变玉米胚组织研制了对二甲基亚硝胺（ＤＭＮＡ）、二乙基亚硝胺（ＤＥ－ＮＡ）和甲基苄基亚硝胺（ＭＢＮＡ）等选择性响应的新型组织传感器。该传感器灵敏度高,重现性好,选择性好,其线性范围２．０×１０－６～２．０×１０－３ｍｏｌ·Ｌ－１,检测下限１．３×１０－７ｍｏｌ·Ｌ－１,斜率为５９．２（３０°Ｃ,ｐＨ７．５）。     

串联式压电传感器测定水中阴离子表面活性剂

基于阴离子表面活性剂与季铵盐反应前后电导的改变和压电传感器能响应溶液电导率的性质,建立了串联式压电传感器测定水中阴离子表面活性剂的新方法。在５００μｇ氯化十六烷基吡啶存在下,十二烷基磺酸钠的浓度在３．６×１０－７～５．７×１０－５ｍｏｌ·Ｌ－１范围内与压电传感器的频移值呈线性关系,相关系数为０．９９８９,检测下限为１．７×１０－７ｍｏｌ·Ｌ－１。用此法测定了环境水样中的阴离子表面活性剂,其加标回收率为９４．４％～１００．２％,相对标准偏差小于４．９％     

1．5次微分吸附伏安法测定微量铋

本文提出了在乙酸－乙酸钠介质中，铋（三价）－皮素配合物１．５次微分吸附伏安法测定铋的方法。试验了各种影响因素，建立了一个测定范围为３．０×１０－９～１．０×１０－７ｍｏｌ／Ｌ、检出下限为１．０×１０－９ｍｏｌ／Ｌ的测定铋的新方法。该法可用于人发及锰盐等样品中微量铋的分析，结果令人满意。     

分光光度法测定盐酸环丙沙星

研究了０．１ｍｏｌ·Ｌ＾－１的硫酸介质中，盐酸环丙沙星与三氯化铁的显色反应。盐酸环丙沙星浓度在３．３×１０＾－５￣７．３×１０＾－４ｍｏｌ·Ｌ＾－１（０．０１２￣０．２７ｍｇ·Ｌ＾－１）范围内符合比尔定律，ε＝１．８５×１０＾３Ｌ·（ｍｏｌ·ｃｍ）＾－１。测得络合物组成比为１：１。本方法简便准确，可用于片剂和胶囊中盐酸环丙沙星的测定。     

水质中钙,镁和硬度的在线监测

对水质中钙、镁和硬度的在线监测方法进行了研究。利用稳定性好、灵敏度高的偶氮氯膦Ⅲ作显色剂,在ｐＨ７０时,加入ＥＧＴＡ掩蔽钙,测定镁;在ｐＨ为２５,掩蔽镁的干扰,测定钙,在线分析时,采用混合分析流程,加三通分流消除气泡干扰,测定数据稳定可靠,镁的测试范围１×１０－３～４８×１０－３ｍｍｏｌ／Ｌ,钙的测试范围１×１０－３～５０×１０－３ｍｍｏｌ／Ｌ,钙镁的检测限０５×１０－３ｍｍｏｌ／Ｌ,该方法开发成在线仪器,可单独测定钙、镁,又可根据水样得到水质硬度,具有较好的实用性。     

芦竹碱PVC膜电极的研究

本文研制出以芦竹碱－四苯硼钠为电活性物的ＰＶＣ膜电极。在ｐＨ２．０～７．０水浴液中，电极的残性响应范围、平均斜率和检出下限分别为６．３×１０￣５～１．０×１０￣（－２）ｍｏｌ／Ｌ、５７ｍＶ／△ＰＣ和２．２×１０￣（－５）ｍｏｌ／Ｌ．电极响应速度快，稳定性好，可用于快速测定植物中芦竹碱的含量，方法准确可靠。     

毛细管气相色谱法测定多种有机磷农药在柑桔上的残留

本文采用ＨＰ１７０１毛细管柱为分离柱,测定了柑桔中７种有机磷农药残留量;比较了常用的七种有机磷农药在柑桔生长不同时期的残留情况。本法对７种有机磷农药的回收率范围为８３．５～１０６．４％,变异系数为３．０～７．８％,检测限为０．１～２０×１０－９ｇ。     

An improved algorithm for the three‐fluid‐phase VLLE flash calculation

The VLLE flash is important in water and hydrocarbons mixtures, hydrocarbon and CO₂ rich mixtures, and hydrocarbon methane rich mixtures that are encountered in reservoir performance and recovery studies. A robust VLLE flash algorithm is proposed. The equilibrium and mass balance equations are solved as a constrained minimization problem. An inverse barrier function is used to handle the inequality constrains to solve for the phase fractions. It warrants always arriving to the solution. The challenging cases analyzed showed that the initialization procedure proposed, together with successive substitution iteration in the outer loop, is a good method for a stable VLLE flash algorithm, even near critical points. Whenever the result is in the region outside the three‐phase physical domain, the solution suggests that the system has fewer phases. In one of the cases analyzed, a region with three liquid phases was encountered and the algorithm found two different solutions with positive phase fractions. © 2015 American Institute of Chemical Engineers AIChE J, 61: 3081–3093, 2015     

合成硝基麝香在溶剂中固液平衡研究

采用综合法测定了合成硝基麝香在乙腈等溶剂中的固液平衡数据,采用UNIFAC方程对麝香在单一溶剂中的固液平衡数据进行了关联,结果表明UNIFAC方程能够较好地关联实验数据并具有一定的预测功能,为麝香混合物的溶液结晶分离提供了理论依据。     

多组元溶液分相条件的探讨

本文通过改型的UNIQUAC方程 ,利用NEWTON RAPHSON法计算了二元、三元及四元液液平衡数据。从中发现 ,当具有部分互溶性质组分的活度系数发生突变时 ,则该体系就会出现分层现象。为此 ,本文认为具有部分互溶组分活度系数的突变可做为多组元溶液分相的判据。     

汽液相平衡测定的研究进展

介绍了汽液相平衡的测定方法、研究现状及气相色谱法在汽液相平衡研究中的应用.     

Phase equilibria and structural properties of thiophene/[Bmim][BF4]: A molecular insight from monte carlo simulations

The phase equilibria of thiophene in 1‐butyl‐3‐methylimidazolium tetrafluoroborate ([Bmim][BF₄]) is calculated by Monte Carlo simulation in Gibbs ensemble using a united atom force field. The liquid density of studied ionic liquid and the vapor pressure of thiophene in [Bmim][BF₄] were compared with corresponding experimental data reported in the literature, and a good agreement was obtained. In order to describe the solubility of thiophene in this ionic liquid, we have calculated the radial distribution functions and spatial distribution functions of thiophene/IL mixtures to study the interaction of thiophene with cations and anions of [Bmim][BF₄] in the liquid phase. The local composition concept in fluid was also examined to give further insight into the liquid structure. The results show that thiophene is well organized around the terminal carbon atom of the butyl or methyl chain attached to the imidazolium ring of cations and tends to adopt a symmetrically distribution on the anions. © 2014 American Institute of Chemical Engineers AIChE J, 60: 3916–3924, 2014     

尿素物系汽液平衡的相图计算法

本文可视为是新编《尿素工学》一书的第二篇补充文章［１］。尿素物系是一个挥发性弱电解质物系，汽液平衡热力学计算方法甚为复杂。本文提供一个在相图上计算汽液平衡的新方法，简易实用。     

A Hydration Shell‐Based Thermodynamic Model for Aqueous Two‐Phase Systems

In this work a Flory‐Huggins model modified to account for some unique features of Aqueous Two‐Phase Systems is presented. The model takes into account observed solvation between water and polymer molecules through the incorporation of a hydration shell to express the number of water molecules bonded to each polymer molecule. The parameters of the modified equation were determined using experimental data of ATPS containing poly (ethylene glycol) and dextran. The results revealed remarkable improvement in the correlation ability of the model. A general expression that defines the number of water molecules in the hydration shell was also obtained.     

十二烷基苯磺酸钠-异丙醇-水固液平衡实验数据测定及关联

测定了十二烷基苯磺酸钠 (SDBS)于不同温度下在异丙醇 (C3H7OH)和水 (H2 O)的混合溶剂中的溶解度 ,并考察了水中氢氧化钠 (Na OH)含量对 SDBS溶解度的影响。同时绘制出三元相图 ,并利用推导的溶解度模型对固液平衡数据进行关联 ,结果良好