Ion Chromatographic Analyses of Sea Waters, Brines and Related Samples

Gros, Nataša

doi:10.3390/w5020659

Cited by 24 publications

(7 citation statements)

References 52 publications

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“…In situ measurements of water temperature and pH were done with a portable pH meter and coupled thermometer (HI9126, Hanna Instruments), whereas electrical conductivity was measured with a portable conductivity meter (Orion Star A322, Thermo Scientific). Samples were also collected in parallel for the analysis of major cations (potassium, sodium, calcium, and magnesium) by ion chromatography, and the anion, chloride was performed by the argentometric method, and sulfate by the gravimetric method (Gros, 2003). During 2013 and 2014 in L. Chungará, samples were collected in precombusted (4 h at 450°C) glass bottles for the analysis of dissolved organic carbon (DOC) and dissolved nitrogen (DN).…”

Section: Methodsmentioning

confidence: 99%

Bacterial Communities Associated With Spherical Nostoc Macrocolonies

et al. 2019

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Species of the genus Nostoc (Cyanobacteria) can form large colonies of up to several centimeters in diameter that may represent a unique habitat for bacteria in freshwaters. Bacteria inside the colony are probably segregated from the surrounding water and largely dependent on the metabolism of this primary producer. However, the existence of a specific bacterial community associated with free-living representatives of Nostoc from lakes and streams is unknown. Here, we studied large Nostoc spp. colonies (ca. 2–10 cm in diameter) from two adjacent, high altitude aquatic environments and assessed the diversity, and community composition of the bacterial community associated with the inner gelatinous matrix (GM). Further, we compared this community with that of the lake’s littoral zone where the colonies live or with the outer layer (OL) of the colony in samples collected from a stream. Alpha bacterial diversity in the inner GM of the colonies from both sites was lower than in the littoral zone or than in the OL. Significant differences in community composition were found between the inner and the OL, as well as between the inner GM, and the littoral zone. Further, these differences were supported by the putative metabolic processes of the bacterial communities. Our results indicate the existence of a specific bacterial community inside macrocolonies of Nostoc spp. and also imply that the inner environment exerts a strong selection. Finally, these large colonies represent not only a unique habitat, but probably also a hotspot of bacterial activity in an otherwise oligotrophic environment.

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Section: Methodsmentioning

confidence: 99%

Bacterial Communities Associated With Spherical Nostoc Macrocolonies

et al. 2019

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“…In fact, several examples have been reported concerning the determination of dissolved silica using an IEC with postcolumn derivatization/absorption spectrometric detection. [15][16][17][18][19][20] However, there was no example that applied the method to high salinity samples, such as seawater.…”

Section: Introductionmentioning

confidence: 99%

Determination of Dissolved Silica in Seawater by Ion-exclusion Chromatography with Post-column Derivatization/ Silicomolybdenum Yellow Detection

2018

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The determination of dissolved silica in seawater was investigated by an ion-exclusion chromatography with a post-column derivatization/silicomolybdenum yellow method. To determine dissolved silica in seawater accurately, the experimental conditions, such as the volume of a reaction coil, the eluent concentration and the sample dilution factor, were optimized. This is the first report that has examined the details of the experimental condition for the measurement of dissolved silica in seawater by ion-exclusion chromatography with silicomolybdenum-yellow detection. The developed method was compared with the widely used continuous flow analysis and an ion-exclusion chromatography isotope dilution inductively coupled plasma mass spectrometry, which is a primary method of measurement. The analytical results by the three methods were in good agreement, considering the expanded uncertainty with a coverage factor, 2. The validity of the three methods was confirmed with each other. The developed method can give a quantitative value with less than 1% of the expanded uncertainty, and can be used for the determination of dissolved silica in candidate reference materials having a seawater matrix.

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“…Due to the sensitivity, stability of the separation system, good selectivity, and capacity of multi-element analysis in a single run, ion chromatography coupled with conductivity detection (IC-CD) has become the method of choice for the separation and determination of multiple cations and anions in various sample matrices [ 18 , 19 , 20 ]. This powerful and reliable technique has been widely used for analysis of Na + , K + , Ca 2+ , Mg 2+ , and anions in biological samples [ 21 ], food [ 22 , 23 ], biodiesel [ 24 , 25 , 26 ], oil [ 27 ], plant extract [ 28 ], and water [ 29 , 30 , 31 ], particularly at the level of trace concentrations.…”

Section: Introductionmentioning

confidence: 99%

Determination of Inorganic Cations and Anions in Chitooligosaccharides by Ion Chromatography with Conductivity Detection

Cao

Fan

et al. 2017

Marine Drugs

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Chitooligosaccharides (COSs) are a promising drug candidate and food ingredient because they are innately biocompatible, non-toxic, and non-allergenic to living tissues. Therefore, the impurities in COSs must be clearly elucidated and precisely determined. As for COSs, most analytical methods focus on the determination of the average degrees of polymerization (DPs) and deacetylation (DD), as well as separation and analysis of the single COSs with different DPs. However, little is known about the concentrations of inorganic cations and anions in COSs. In the present study, an efficient and sensitive ion chromatography coupled with conductivity detection (IC-CD) for the determination of inorganic cations Na+, NH4+, K+, Mg2+, Ca2+, and chloride, acetate and lactate anions was developed. Detection limits were 0.01–0.05 μM for cations and 0.5–0.6 μM for anions. The linear range was 0.001–0.8 mM. The optimized analysis was carried out on IonPac CS12A and IonPac AS12A analytical column for cations and anions, respectively, using isocratic elution with 20 mM methanesulfonic acid and 4 mM sodium hydroxide aqueous solution as the mobile phase at a 1.0 mL/min flow rate. Quality parameters, including precision and accuracy, were fully validated and found to be satisfactory. The fully validated IC-CD method was readily applied for the quantification of various cations and anions in commercial COS technical concentrate.

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Ion Chromatographic Analyses of Sea Waters, Brines and Related Samples

Cited by 24 publications

References 52 publications

Bacterial Communities Associated With Spherical Nostoc Macrocolonies

Bacterial Communities Associated With Spherical Nostoc Macrocolonies

Determination of Dissolved Silica in Seawater by Ion-exclusion Chromatography with Post-column Derivatization/ Silicomolybdenum Yellow Detection

Determination of Inorganic Cations and Anions in Chitooligosaccharides by Ion Chromatography with Conductivity Detection

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