Suppressed ion chromatographic determination of lithium, sodium, ammonium and potassium concentrations in sub-surface brines

Singh, R. P.; Abbas, Nureddin M.

doi:10.1016/0021-9673(95)00958-2

Cited by 15 publications

(15 citation statements)

References 23 publications

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“…Ion chromatography [1,10,[23][24][25][26][27][28][29][30][31][32] has been also used for the determination of NH 4 + in waters in addition to spectrophotometry [33], CE [34], fluorimetry [14,35] and potentiometry [36,37]. Nevertheless, problems in the resolution of low molecular mass amine [1] and NH 4 + peaks as well as permanent damage of the column with consequent shortening of its life time can occur when high salinity water samples are directly analyzed [31].…”

Section: Liquid Chromatography 1455mentioning

confidence: 97%

Determination of low-molecular-weight amines and ammonium in saline waters by ion chromatography after their extraction by steam distillation

et al. 2016

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A new method was developed for the determination of ammonium ion, monomethylamine and monoethylamine in saline waters by ion chromatography. Steam distillation was used to eliminate matrix interferences. Variables such as distillation time, concentration of sodium hydroxide solution and analyte mass were optimized by using a full two-level factorial (2(3) ) design. The influence of steam distillation on the analytical curves prepared in different matrices was also investigated. Limits of detection of 0.03, 0.05 and 0.05 mg/L were obtained for ammoniumion, monomethylamine and monoethylamine, respectively. Saline water samples from the Brazilian oil industry, containing sodium and potassium concentrations between 2.0-5.2% w/v and 96-928 mg/L, respectively, were analyzed. Satisfactory recoveries (90-105%) of the analytes were obtained for all spiked samples, and the precision was ≤ 7% (n = 3). The proposed method is adequate for analyzing saline waters containing sodium to ammoniumion, monomethylamine and monoethylamine concentration ratios up to 28 000:1 and potassium to ammonium, monomethylamine and monoethylamine concentration ratios up to 12 000:1.

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Section: Liquid Chromatography 1455mentioning

confidence: 97%

Determination of low-molecular-weight amines and ammonium in saline waters by ion chromatography after their extraction by steam distillation

et al. 2016

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“…Because traditional cation exchangers (sulfonic [6], carboxylic [7][8][9][10] or silica-gel [11]) have similar selectivity for Na ? and NH 4 ? , sufficient resolution is not achieved during analysis if the concentrations of these ions are too different and if alkaline earths should also be monitored within the same run.…”

Section: Inorganic Cations and Ammoniamentioning

confidence: 98%

“…Because the ammonium ion was retained for longer and the sodium ion peak remained virtually unchanged, the separation of Na ? and NH 4 ? at concentration ratios as high as 60,000:1 was possible in the presence of 10 mM 18-crown-6 ether.…”

Section: Inorganic Cations and Ammoniamentioning

confidence: 99%

“…In the last decade, it has become increasingly clear that samples characterized by diverse concentration ratios of adjacent peaks are of common occurrence, mainly among environmental matrices. A typical case is given, for example, by sub-surface brines [4], seawater [5], waters intended for human consumption, treated or from wells, where, for instance, low amounts of NH 4 ? ion and high concentrations of Na ?…”

Section: Inorganic Cations and Ammoniamentioning

confidence: 99%

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The Challenging Role of Chromatography in Environmental Problems

2011

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This review details the contribution of ion chromatography (IC) to environmental analysis. With reference to the problems usually encountered in environmental analysis (low concentrations to be detected and matrix interference), applications of IC in the analysis of inorganic cations in water and in the analysis of the platinum group elements (PGEs) in air particulate matter, and the advantages of this technique over more traditionally accepted analytical techniques will be discussed. Other current environmental topics, for example the occurrence of haloacetic acids (HAAs) in drinking water, will be covered, highlighting the importance of IC as an emerging powerful tool for monitoring HAAs, recognized also by the EPA that recently adopted it in a regulated method (Method 557).

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“…Nevertheless, if these analytes are present in disproportionate concentration ratios, their separation and hence their quantification is difficult, especially if they elute one next to the other. A typical environmental case is given by the low amounts of NH þ 4 ion and the high concentrations of Na + that can be present in subsurface brines [1] in seawaters [2] or in waters to be intended for human consumption, treated or from wells. Since traditional cationexchangers (sulphonic [3], carboxylic [4] or silica gel [5]) have similar selectivity for Na + and NH þ 4 , it is not possible to achieve a sufficient resolution if the concentrations of the mentioned ions are too much different.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of alkali, alkaline earths and ammonium in natural waters by ion chromatography

Bruzzoniti

Carlo

Fungi

2008

J of Separation Science

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An ion chromatographic method has been developed for the determination of alkali (Li + , Na + , K + ), alkaline earths (Ca 2+ , Mg 2+ , Ba 2+ , Sr 2+ ) and ammonium ion in waters. The usual difficulties encountered during traditional cation-exchange separations (incomplete resolution for Na + and NH 4 + present in disproportionate concentration ratios) have been overcome tuning the selectivity of the separation by the introduction of 18-crown-6 ether in the mobile phase using an IonPac CS12A (15063 mm id) column. After a detailed study of the effect of mobile phase components on separation, a gradient elution from 26 mM methanesulphonic acid (MSA) with a step change at 9 min to 60 mM MSA (0.5 mM 18-crown-6) provided the required baseline separation for the eight selected analytes. The method developed provides the advantage of the determination, in the same analytical run, also of strontium and barium, which is usually performed by spectroscopic techniques. Within-day and between-day repeatability have been assessed, observing between-day RSD included between 0.3 and 1.8% for retention times and 0.6 and 7.2% for peak areas. The method has been finally tested for the analysis of water samples of different provenience (well, tanks, water system) and results compared with those obtained by the laboratory in charge of the control of drinking water for the city of Torino (Italy).

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Suppressed ion chromatographic determination of lithium, sodium, ammonium and potassium concentrations in sub-surface brines

Cited by 15 publications

References 23 publications

Determination of low-molecular-weight amines and ammonium in saline waters by ion chromatography after their extraction by steam distillation

Determination of low-molecular-weight amines and ammonium in saline waters by ion chromatography after their extraction by steam distillation

The Challenging Role of Chromatography in Environmental Problems

Simultaneous determination of alkali, alkaline earths and ammonium in natural waters by ion chromatography

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