Ion Chromatographic Determination of Traces of Sodium,Magnesium and Chlorine in Gadolinium Nitrate

Abstract

Two independent and sensitive ion chromatographic methods with suppressed conductivity were developed for determination of traces of Cl, Na, and Mg in gadolinium-nitrate. Na-Mg was determined by cation-exchange column after matrix separation, whereas Cl was analyzed without matrix separation by high capacity anion-exchange column. Detection limit for Cl was 0.01 µg mL^?1 in sample solution and 1 µg g^?1 in solid sample. The reproducibility (100 µL injected) was better than 3%, 3% and 4% at 50, 25 and 50 µg L^?1 level for Cl, Na, and Mg respectively. The overall precision was better than ±7% for Na-Mg and ±5% for Cl.     

离子排斥色谱法测定有机酸的研究

研究了利用高效离子排斥色谱（ＨＰＩＣＥ）和电导检测器分离和测定有机酸的色谱条件。选用低电导的辛烷磺酸为淋洗液，对８种有机酸的分离条件进行了研究，并将该法应用于化学镀镍液中有机酸的分析，结果令人满意。     

离子色谱法测定蔬菜中硝酸盐

应用离子色谱法代替原用的镉还原法(即国标法)测定了蔬菜中硝酸根。离子色谱法的应用使测定的选择性、准确性、精密度和速度得到改善。蔬菜样品经捣碎,用自制的活性碳柱脱色和用微孔膜过滤等步骤的预处理后所得溶液即可进行离子色谱测定。所用色谱柱为IonpacAS14A-3C阴离子分离柱,淋洗液为Na2CO3和NaHCO3的混合溶液,洗出液中的NO3-经转化为游离酸(HNO3)后用电导检出器测定其导电率。在量程为30μS和进样液(50μL)中NO3-浓度在1.0~32.5 mg.L-1的范围内,NO3-离子峰高的积分值与进样液中NO3-浓度之间呈线性关系。用含不同浓度NO3-离子的3种蔬菜按方法测定以检验其精密度,所求得RSD值(n=6)在0.7%~5.6%之间。经检验,方法的测定结果与镉还原法的结果之间无显著差异。     

离子色谱法测定茶叶中的无机阴离子

提出了离子交换色谱法分离测定茶叶中F-、Cl-、Br-、NO3-、H2PO4-和SO2-4 6种无机阴离子含量的方法.茶叶样品中6种阴离子用水在95℃超声萃取20 min后,经IonPac ASll-HC阴离子分离柱,AGll-HC阴离子保护柱,以氢氧化钾为淋洗液,浓度从15 mmol·L-1到30 mmol·L-1进行梯度淋洗.F-、Cl-和Soi2-4的峰面积与其质量浓度在0.01～150.0 mg·L-1范围内,H2PO-4、NO-3和Br-在0.05～150.0 mg·L-1范围内呈线性关系.6种离子的检出限(3S/N)均小于0.03 mg·L-1.该方法用于茶叶样品中F-、Cl-、Br-、NO-3、H2PO-4和SOi2-4的测定,加标回收率在90.9%～100.0%之间,测定值的相对标准偏差(n=5)小于3.5%.     

Ion Chromatographic Determination of Anions in Environmental Samples

Abstract

The use of ion-exchange chromatography with an IonPac AS 14 column, 3.5 mM Na₂CO₃/1.0 mM NaHCO₃ eluent and suppressed conductivity detection provides a simple, cost-effective, fast, accurate, and highly sensitive method for the determination of F^?, Cl^?, NO₂ ^?, Br^?, NO₃ ^?, PO₄ ^2?, SO₄ ^2?, and C₂O₄ ^2? at low μ/L levels in environmental samples. Data on sensitivity, selectivity, accuracy, and % relative standard deviation are described. The method is suitable for many environmental applications including atmospheric aerosols (exposed on cellulose, glass fiber, and quartz filters), rainwater, cloud water, potable- and non-potable waters, and carbonated waters. Dominant components of the aerosol were SO₄ ^2?, NO₃ ^?, and Cl^?. Rainwater, on the other hand, has relatively very low concentrations of these three species. The wide-spread concentration range for Cl^? in variety of water samples and the high concentrations for SO₄ ^2? in drinking water are striking. Determination of the anionic composition of carbonated waters revealed a considerable variation of the individual anions.     

低酸度淋洗液离子色谱法测定多聚磷酸盐

在国产阴离子分离柱上采用含钙和镁离子的淋洗液，由于Ｃａ＾２＋和Ｍｇ＾２＋与复杂的多聚磷酸根离子形成螯合物而提高了淋洗能力，加快了分析速度，大大降低了淋洗液的酸度和盐浓度，对几种工业三聚磷酸钠样品进行了测定，与化学法相比，相对误差小于１．５％，加入回收率在９９％－１０９％之间。     

离子色谱法测定环丁砜中痕量阴离子

采用离子交换树脂处理除去样品中杂质干扰组分,很好地消除了基体效应。以Dionex AS9-HC作为分离柱,AG9-HC作为保护柱,9mmol·L^-1碳酸钠溶液作为淋洗液,抑制电导检测。离子色谱法测定环丁砜中氯离子、硝酸根、硫酸根阴离子,检出限分别为14,39,54μg·L^-1,方法的回收率在104.2％～123．2％之间。     

离子色谱法测定水果中亚硝酸盐和硝酸盐

建立了离子色谱法测定水果中亚硝酸盐和硝酸盐的方法.试样溶液中亚硝酸盐和硝酸盐在YSA-8阴离子色谱柱分离,以4 mmol.L-1碳酸钠-3 mmol.L-1碳酸氢钠为流动相,电导检测.亚硝酸盐和硝酸盐的检出限分别为0.02 mg·L-1和0.11 mg·L-1,工作曲线的线性范围分别在0.2～20.0 mg·L-1和0.3～30.0 mg·L-1范围内.该方法已应用于水果中亚硝酸盐和硝酸盐的测定,测得回收率在93.4%～105.2%之间.     

离子色谱法测定食品添加剂三聚磷酸盐中的杂质含量

研究了离子色谱法检测食品添加剂三聚磷酸盐中杂质含量的分析方法。用NaOH梯度淋洗,流速为1.8 mL/min,成功地同时测定了三聚磷酸盐中的Cl- NO- 3 SO2- 4 磷酸盐 焦磷酸钠 三偏磷酸钠等杂质的含量。各杂质在检测条件下有很好的线性,所测杂质的相对标准偏差范围为0.22%-8.32%。采用AS11型阴离子色谱柱,样品测定的整个过程可在15 min内完成。实验结果表明,该方法具有分析时间短 线性范围宽 灵敏准确 试剂用量少等优点。     

Ion Chromatographic Determination of Selected Anions in Mineral Waters

Abstract

Suppressed ion-chromatography using Na₂CO₃/NaHCO₃ as eluent was applied to the determination of chloride, sulphate, nitrate and bromide in highly mineralised waters. The effect of different concentrations of hydrogen carbonate on the retention times of the determination of the four selected anions was studied. Depending on the total concentration of ionic species, dilution of the sample is recommended to obtain retention times approaching those of the anion standard. The stability of sample composition was not affected by the presence of iron(III) ions (up to 15 mgL^?1).     

离子色谱法测定放射性废液中硫酸根

采用取样量较少的离子色谱法测定了放射性废液中硫酸根含量.放射性废液先经稀释1 250倍,然后进行离子色谱测定.进样量为100 μL,将硫酸根标准溶液加入于试样基体溶液中制作工作曲线.试样的基体溶液系在放射性废液中加入钡离子使其中硫酸根完全生成硫酸钡沉淀除去后制成.由于采用了上述的高倍稀释方法,不但使废水样的放射性大大降低,而且还避免了溶液中共存的金属离子生成沉淀而堵塞色谱柱的干扰因素.分别在从两个试样制备的基体液中加入硫酸根标准溶液制作工作曲线,算得其相关系数分别为0.998 6和0.997 4,方法的检出限为18.9 μg·L-1.根据测量峰面积计算所得的相对标准偏差为1.46%,回收率试验的结果在96.7%～103.8%之间.     

离子色谱法测定血液透析浓缩液中乙酸根

血液透析目前在医疗领域广泛应用,主要用于肾功能衰竭。透析液浓缩液是指一种含有高浓度电解质的液体,使用时按特定比例用透析用水稀释后成透析液使用,在我国属三类医疗器械产品,其质量直接关系到病人健康和血液透析效果。我国透析液浓缩液标准正在制定中,国外主要有两个标准。透析液浓缩液主要常由碳酸氢钠浓缩物与乙酸盐浓缩物混合而成。血液透析浓缩液中乙酸根浓度要求为标示量±10％,所以测定血液透析浓缩液中乙酸根对于产品质量的控制非常重要。     

离子色谱法分析加碘食盐中的微量碘

研究了离子色谱法分析加碘食盐中的微量碘的分析方法。用硫化钠将加碘盐中的碘酸根还原成碘离子，用乙醇提取碘离子，用较高浓度的碳酸钠－碳酸氢钠淋洗液；紫外检测波长２１５ｎｍ；碘的回收率在９６．１％￣９９．８％之间，方法简便，快速。     

High-Performance Liquid Chromatographic Determination of Lasalocid Sodium in Chicken Tissue

Abstract

A high-performance liquid chromatographic (HPLC) method with fluorometric detection has been developed to determine lasalocid sodium(Fig.1) residues in chicken tissues. Lasalocid sodium was extracted from tissues by homogenizing them with methanol, purified by silicagel cartridge column and separated by HPLC using an ODS column.     

离子色谱法测定浓碱中痕量阴离子

浓碱中痕量阴离子的测定在化学化工和半导体工业中非常重要,而常规测定浓碱中阴离子的方法是采用分光光度法和浊度法。采用这些方法只能逐一对样品中的阴离子进行分析测定[1],不仅烦琐费时,而且测定结果往往不准确。离子色谱对于测定常规阴离子具有很高的灵敏度和较低的检出限,     

金属离子对部分阴离子色谱测定的干扰及消除

本文对 F~-、柠檬酸的离子色谱法测定中 Al~(3+)、Fe~(3+)的干扰,和三乙醇胺、柠檬酸、磺基水杨酸对离子色谱法测 F~-时 Al~(3+)的干扰掩蔽及 EDTA 和磺基水杨酸对离子色谱法测柠檬酸时 Fe~(3+)、Al~(3+)干扰的掩蔽进行了讨论。     

Development of a High Performance Ion Chromatographic (HPIC) Method for the Determination of Sodium Metabisulfite in Parenteral Formulations

Abstract

A high performance ion chromatographic (HPIC) method for the determination of sodium metabisulfite (a pharmaceutical antioxidant) in injectable formulations is described. The method is selective for both the sulfite and sulfate ions with a minimum of sample preparation.