氧弹燃烧-离子色谱法测定高分子聚合物的卤素离子

采用氧弹燃烧法对塑料样品进行燃烧,用碳酸钠作为吸收液进行吸收,建立了离子色谱法分离测定微量卤素离子的方法.离子色谱条件为:IonPac AS22离子交换柱,碳酸盐等度淋洗,抑制型电导检测.用该方法对塑料颗粒和塑料瓶盖中的氯离子进行测定,加标回收率分别为92.25%～95.68%、92.37% ～95.52%.     

离子色谱同时测定中草药中磷硫含量

应用离子色谱法同时测定了硫酸根和磷酸根的含量。用茶叶(GBW10016)、柑橘叶(GBW10020)和黄芪(GBW10028)标准物质来验证方法的准确性,测定值与标准值基本吻合。磷在0.01～100.0μg/mL,硫在0.01～60.00μg/mL范围内呈良好的线性关系(R2≥0.9993),磷和硫的检出限分别为0.0...     

氧瓶分解—离子色谱法测定胱氨酸标准物质中的硫

介绍了用氧瓶分解－离子色谱测定胱氨酸标准物质中硫元素含量的方法。以美国进口胱氨酸标准物质为样品,用氧瓶燃烧分解,以碱性吸收液吸收,使硫元素转化为硫酸根阴离子,然后进行离子色谱分析。分析数据与标准物质标称值进行了比较,结果令人满意。     

离子色谱法测定氯化石蜡中的总氯量

采用氧瓶燃烧法处理氯化石蜡样品,用离子色谱测定吸收液中Cl^-的方法来确定氯化石蜡的总氯量。在Metrosep A SUPP5型阴离子分离柱上,以3．2mmol／LNa2CO3和1．0mmol／LNaHCO3混合溶液作为淋洗液,抑制型电导检测,检出限为0．87μg／L,线性范围0．1—4mg／L,相对标准偏差与回收率分别为1．71％～2．14％、94．4％-103．1％。该方法简便、快速,结果与国家标准法比较无显著性差异。     

离子色谱法测定糖蜜中总硫

将糖蜜置于充满氧气的石英瓶中燃烧,样品中的硫转化为硫的氧化物,然后用20mL含有5滴30%的H2O2的水溶液吸收30min使氧化物成为硫酸根。在淋洗液为V(Na2CO3)∶V(NaHCO3)=1.8∶1.7的离子色谱条件下测定硫酸根,从而获得糖蜜中的总硫。方法的回收率为94.2%～106.3%,线性范围为0.02～60μg/mL,检出限为0.00324μg/mL。该方法具有操作简单,较宽的线性范围和低的检测限,准确度高,精密度好的优点。     

氧瓶燃烧-离子色谱法分析食品中的微量碘

1　引　　言碘是人的身体和智力发育必需的微量元素。本文采用氧瓶燃烧 离子色谱法检测了紫菜、海带、烤鱼片等食品中碘的含量 ,具体做法为将食品样品置入氧瓶中进行燃烧 ,用氢氧化钠吸收液吸收 ,用离子色谱分离 ,用紫外检测器器检测。为了解决烤鱼片等含碘量非常低的食品的检测问题 ,本文研究了将一份样品分成多份 ,将分成的多份样品多次燃烧 ,用同一吸收液吸收的方法。实验证明 ,用此方法对被测碘的食品进行预处理 ,快速、简便、灵敏 ,并且不会产生干扰组分。2　实验部分2 .1　仪器与主要试剂　 2 0 1 0ｉ离子色谱仪 (美国戴安公司 )。自…     

汽车装饰材料挥发性有机物的气相色谱-质谱法测定

采用铝制密封容器处理样品, 以Tenax管富集甲苯、二甲苯、乙苯、苯乙烯、十四烷、邻苯二甲酸二丁酯、邻苯二甲酸二异辛酯等挥发性有机物,2,4-二硝基苯肼吸收液富集甲醛、乙醛.用气相色谱-质谱/选择离子监测法测定,优化了样品处理及分析条件,建立了测定汽车装饰材料的挥发性有机物的方法.该法克服了采用塑料容器产生的干扰,检出限低于2.0 μg/m3,比现有方法低2个数量级.适用于汽车内部塑料、皮革、纺织品、泡棉等材料的检测.     

薄层色谱在高分子研究中的应用

本文综述了薄层色谱的高分子研究中的应用概况，着重介绍发薄层色谱在高分子的分离、分子量分布、组成分布、溶解度参数、官能度分布和高分子材料中助剂的测定等的应用。     

《色谱在材料分析中的应用》

该书为《色谱技术丛书》之一,系统介绍了材料分析中应用的各种色谱方法与技术,内容包括气相色谱、高效液相色谱、离子色谱、凝胶渗透色谱、毛细管电泳以及一些联用技术在无机材料中的金属元素和非金属元素的分析、无机材料和     

《色谱在材料分析中的应用》

该书为《色谱技术丛书》之一,系统介绍了材料分析中应用的各种色谱方法与技术,内容包括气相色谱、高效液相色谱、离子色谱、凝胶渗透色谱、毛细管电泳以及一些联用技术在无机材料中的金属元素和非金属元素的分析、无机材料和     

离子色谱法及聚类分析研究主流烟气中的有机酸

建立了超声辅助萃取-离子色谱法同时测定卷烟主流烟气中主要有机酸的方法.采用20 mL 30 mmol/L J NaOH溶液在50℃下对捕集了卷烟主流烟气的剑桥滤片超声萃取50 min,AS11-HC分离柱、Ion AG11-HC保护柱、ASRS-ULTRAⅡ抑制器,KOH溶液为淋洗液,用电导检测器同时测定了卷烟主流烟气中的乳酸、甲酸、乙酸、丙酸、苹果酸和草酸的含量.方法的线性范围1.0～400 mg/L,相关系数为0.9990～0.9995,相对标准偏差1.4%～4.8%,检出限0.03～0.09 mg/L,回收率为92%～104%.采用此方法测定了19种不同规格卷烟样品主流烟气中6种有机酸的含量,并且以6种有机酸为指标对样品进行了聚类分析.结果表明,6种有机酸的含量分布特征可反映不同等级卷烟产品的特性,可用于不用等级卷烟产品的比较和分类.     

离子色谱法同时分析啤酒中的有机酸和无机阴离子

建立了以NaOH-甲醇混合淋洗液,离子交换色谱柱,电导检测器检测,分离啤酒中有机酸和无机阴离子的离子色谱法.结果表明：在20 min内分离出啤酒中的11种主要有机酸与无机阴离子,方法回收率和相对标准偏差分别为96.30%～104.8%和0.02%～4.0%.     

Dynamic calibration system for trace analysis in ion chromatography

Summary A dynamic method for the preparation of diluted standards in trace analysis by Ion Chromatography is described. The proposed system uses a diffusion cell that through a capillary tube of known dimension, continuously provides large volumes of highly diluted standard.The diffusion cell setting-up and its working conditions are described, and the advantages and difficulties of the dynamic method are pointed out. Loading the cell with concentrated standard solutions (200–10000 ppm), it was possible to produce diluted Na₂SO₄ standards in the 0.1–10 ppb concentration range. The cell is able to work for nearly a month before the source amount decreased by 1%.The linearity of the calibration device is good and the method is free of systematic errors. Under strictly controlled experimental condition, the diffusion cell provides primary standards because it allows to obtain concentrations only depending on its geometry.     

New methodologies in trace analysis of volatile organic compounds

Two methods for sampling and concentration of volatile organic compounds are reported. In the first method, traps coated with a very thick film (ca. 100 μm) of cross-linked silicone stationary phase are employed. Such thick films can be prepared with a modified dynamic coating procedure, which is briefly described. The low phase ratio traps can be utilized for enrichment of volatiles from gaseous as well as aqueous matrices. The second technique is based on chromatographic evaporation of a solvent in a capillary tube, where the process is sustained by a repeated sample injection and a cyclic flow reversal. In this way, large solvent volumes can be handled by a small volume system. Under optimal conditions, when using a solvent barrier, quantitative recovery is possible even for compounds of comparatively high volatility. Another important application of the technique is extraction of trace components from gases such as headspace samples, polluted air, etc.     

Trace analysis of heavy metal ions by ion chromatography

Summary An ion chromatographic separation technique for heavy metal ions is described. Using pressure-stable, silica-based, ion-exchange supports and standard HPLC equipment with post-column reaction detector high resolution is achieved as well as extremely high sensitivity in the parts per trillion (ppt)-range.     

New materials: analytical and environmental applications in ion chromatography

This review details ion chromatography developments and related applications, mainly in the field of environmental analysis, gained by the evolution in the science and technology for new stationary phases. Unconventional approaches to ion chromatographic separations are also outlined.     

Simultaneous analysis of selenate and selenite by single-column ion chromatography

Summary A rapid, selective and sensitive method has been developed for the simultaneous determination of selenate [Se(VI)] and selenite [Se(IV)] at trace levels by single-column ion chromatography. p-Hydroxybenzoic acid (4 mM) at pH 8.0 was used as the eluent. A low capacity resin-based anion-exchange column was employed for the separation with conductometric detection for quantification. The method requires minimal sample pretreatment. Resolution (R_s) between Se(VI)/Se(IV) was 6.76. Chloride, nitrate and sulfate did not interfere with selenium separation. The detection limits for Se(VI) and Se(IV) were 0.06 μg/ml and 0.110 μg/ml, respectively. The relative standard deviation using a 500-μl loop was 0.90 to 1.86% for Se(VI) and Se(IV), respectively. The method was applied to analyze seleniferous soil samples.     

离子色谱法测定乙二醇中微量有机酸和无机阴离子

建立了以YSA-8阴离子交换柱的离子色谱法分析乙二醇中微量有机酸和无机阴离子的方法,比较了进样乙二醇浓度对F-及有机酸测定结果的影响,进样乙二醇质量分数低于8.5%时,能够得到较准确的数据.用本法对所测的有机酸和无机阴离子检出限均在8.9 μg/L以下,线性相关系数r在0.996～0.999范围内,标准样中各物质的离子峰面积的相对标准偏差(RSD)在4.2%以下(n＝11),对乙二醇质量分数约为8.5%的样品中F-及有机酸的加标回收率在91.6%～100.0%之间,乙二醇含水料直接测定无机阴离子的加标回收率在91.8%～104.8%之间.     

High-performance ion chromatography assessment of inorganic and organic nitrogen fractions in potatoes

A new high-performance ion chromatography assay for organic and inorganic nitrogen analysis has been proposed and examined. In the devised protocol, inorganic sample constituents were measured after ultrasonically assisted water extraction. The amine and amide nitrogen content was assessed after modified Kjeldahl digestion and determined as NH₄⁺, and the total nitrogen content was quantified as NO₃⁻ after microwave-facilitated digestion. Finally, the nitro, azo, azoxy nitrogen was calculated by comparison of the total nitrogen content and all measured nitrogen species. The detection limits of the measured ions were 2.0, 0.82 and 0.17 mg L⁻¹ for nitrate, nitrite and ammonium, respectively. For samples of potatoes, the average shares of the nitrogen species found in the total nitrogen content were: 0.83% of nitrate nitrogen, <0.03% of nitrite nitrogen, 2.1% of ammonium nitrogen, 71% of nitro, azo, azoxy nitrogen, and 26% of amine, amide nitrogen. We expect the method to be applicable to different vegetable samples. The quality of the results obtained was verified by analyzing certified reference material and comparing to another analytical method.