The determination of trace metals in estuarine and coastal waters using a voltammetric in situ profiling system

The Analyst ◽  
2003 ◽  
Vol 128 (6) ◽  
pp. 734 ◽  
Author(s):  
Kate A. Howell ◽  
Eric P. Achterberg ◽  
Charlotte B. Braungardt ◽  
Alan D. Tappin ◽  
David R. Turner ◽  
...  
Keyword(s):  
Trace Metals ◽  
Coastal Waters

Voltammetric in situ measurements of trace metals in coastal waters

2003 ◽  
Vol 22 (11) ◽  
pp. 828-835 ◽  
Author(s):  
Kate A. Howell ◽  
Eric P. Achterberg ◽  
Charlotte B. Braungardt ◽  
Alan D. Tappin ◽  
Paul J. Worsfold ◽  
...  
Keyword(s):  
Trace Metals ◽  
Coastal Waters ◽  
In Situ Measurements

scholarly journals Evaluating the Performance of a Diffusive Gradient in Thin Film Embedded with Montmorillonite for the Determination of Labile Cd, Pb, Mn, and Zn in Natural River Water

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Hong Lien Nguyen ◽  
Anh Tuan Phung ◽  
Trung Kien Tran ◽  
Trung Hai Huynh ◽  
Bich Huong La
Keyword(s):  
Thin Film ◽  
Trace Metals ◽  
River Water ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Exchange Capacity ◽  
Metal Concentrations ◽  
Natural River Water

Montmorillonite (MMT), a natural clay mineral with high ion-exchange capacity and trace metal adsorbability, has been demonstrated to be a suitable binding phase in the diffusive gradient in thin film (DGT) technique for the determination of labile trace metals in synthetic water samples. However, in situ working performance of DGT-MMT with natural river water has not yet been investigated. The present study examined the performance of a DGT containing montmorillonite (MMT) for the in situ isolation and determination of labile Cd, Pb, Mn, and Zn fractions in Lach Tray River water, North Vietnam. The repeatability and accuracy of the DGT-MMT probe were assessed on the basis of seven measurement replicates performed on Cd2+, Pb2+, Mn2+, and Zn2+ standard solutions. Then, the DGT-MMT probes were deployed in Lach Tray River water at different sampling sites to determine the labile metal fractions present in river water. By comparing the total and dissolved metal concentrations in the river water, the distributions of the four tested trace metals were constructed. The proportions of the dissolved fractions of Cd, Pb, Mn, and Zn were 46.7–73.7%, 38.5–63.9%, 36.4–41.6%, and 49.8–67.7%, respectively. The results also showed that the high accuracy and reproducibility of the DGT-MMT data were comparable with measurements obtained by the commonly used DGT-Chelex-100 method. In comparison with the data obtained from anodic stripping voltammetry (ASV), a traditional technique for the determination of non-in situ speciation of trace metals, labile metal concentrations measured by DGT-MMT were in similar ranges. These findings indicate that naturally available montmorillonite can be used as an alternative binding material in DGT probes for the in situ determination of labile metal concentrations in natural watercourses.

scholarly journals In situ evaluation of DGT techniques for measurement of trace metals in estuarine waters: a comparison of four binding layers with open and restricted diffusive layers

2016 ◽  
Vol 18 (1) ◽  
pp. 51-63 ◽  
Author(s):  
Amir Houshang Shiva ◽  
William W. Bennett ◽  
David T. Welsh ◽  
Peter R. Teasdale
Keyword(s):  
Trace Metals ◽  
Coastal Waters ◽  
Gold Coast ◽  
Estuarine Waters

Four different DGT binding layers were used to make selective measurements of trace metals in coastal waters within The Broadwater (Gold Coast, Queensland).

Solid phase extraction coupled with a liquid waveguide capillary cell for simultaneous redox speciation analysis of dissolved iron in estuarine and coastal waters

2015 ◽  
Vol 7 (12) ◽  
pp. 4971-4978 ◽  
Author(s):  
Yaojin Chen ◽  
Yongming Huang ◽  
Sichao Feng ◽  
Dongxing Yuan
Keyword(s):  
Solid Phase Extraction ◽  
Coastal Waters ◽  
Automatic System ◽  
Solid Phase ◽  
Speciation Analysis ◽  
Phase Extraction ◽  
Dissolved Iron ◽  
Liquid Waveguide Capillary Cell

An automatic system for simultaneous determination of Fe(ii) and Fe(ii + iii) in estuarine and coastal waters is established and applied in situ.

scholarly journals SEWAGE DISPOSAL IN SHALLOW COASTAL WATERS

1984 ◽  
Vol 1 (19) ◽  
pp. 209
Author(s):  
Hans H. Dette
Keyword(s):  
Coastal Waters ◽  
Design Method ◽  
Design Parameters ◽  
Initial Dilution ◽  
Depth Of Discharge ◽  
Actual Design ◽  
Applied Design ◽  
Work Done

The disposal of sewage effluent into coastal waters for dilution and final disposal requires an effective mixing of sewage with the seawater in order to achieve the necessary or demanded reduction of bacterial population. Most of the design parameters originate from work done on ocean outfalls. RAWN et al. (I960) developped curves from field data for the determination of initial dilution in a waste issuing from a horizontal port. ABRAHAM (1963) extended these curves to show that the dilution is a function of the depth of discharge port, the diameter of the discharge orifice D and the FROUDE number F. The question, to which extent this calculation method is also valid for outfalls in shallow water regions, is still open. In connection with the actual design of a diffuser in shallow coastal water the method of ABRAHAM was applied together with a new method derived by BERGEN (1980) which is based upon experiments which were carried out in the Leichtweiss- Institute at semi-technical scale. After the diffuser had been taken into operation by means of in-situ measurements the demanded dilution could be checked and herewith also the reliability of the applied design method for practical use.

A submersible flow-injection analyser for the in-situ determination of nitrite and nitrate in coastal waters

1995 ◽  
Vol 51 (1) ◽  
pp. 67-77 ◽  
Author(s):  
Anne Daniel ◽  
Dominique Birot ◽  
Stéphane Blain ◽  
Paul Tréguer ◽  
Bernard Leïldé ◽  
...  
Keyword(s):  
Flow Injection ◽  
Coastal Waters

INDIREKTE PAPIERCHROMATOGRAPHISCHE METHODE ZUR BESTIMMUNG DER HARNOESTROGENE

1961 ◽  
Vol 38 (4) ◽  
pp. 545-562 ◽  
Author(s):  
L. Kecskés ◽  
F. Mutschler ◽  
I. Glós ◽  
E. Thán ◽  
I. Farkas ◽  
...  
Keyword(s):  
Pregnant Women ◽  
Granulosa Cell ◽  
Iron Content ◽  
List Type ◽  
Granulosa Cell Tumour ◽  
Hydrolysis Of ◽  
Phenol Fraction ◽  
Qualitative Determination

ABSTRACT 1. An indirect paperchromatographic method is described for separating urinary oestrogens; this consists of the following steps: acidic hydrolysis, extraction with ether, dissociation of phenol-fractions with partition between the solvents. Previous purification of phenol fraction with the aid of paperchromatography. The elution of oestrogen containing fractions is followed by acetylation. Oestrogen acetate is isolated by re-chromatography. The chromatogram was developed after hydrolysis of the oestrogens 'in situ' on the paper. The quantity of oestrogens was determined indirectly, by means of an iron-reaction, after the elution of the iron content of the oestrogen spot, which was developed by the Jellinek-reaction. 2. The method described above is satisfactory for determining urinary oestrogen, 17β-oestradiol and oestriol, but could include 16-epioestriol and other oestrogenic metabolites. 3. The sensitivity of the method is 1.3–1.6 μg/24 hours. 4. The quantitative and qualitative determination of urinary oestrogens with the above mentioned method was performed in 50 pregnant and 9 non pregnant women, and also in 2 patients with granulosa cell tumour.

Sign in / Sign up

Export Citation Format

Share Document