scholarly journals A Simple and Rapid Pretreatment Method for the Analysis of all PCB Congeners in Water Samples Containing Sulfur

2021 ◽  
Vol 31 (0) ◽  
pp. 112-119
Author(s):  
Yuka MAKITA ◽  
Ayato KAWASHIMA
Keyword(s):  
Water Samples ◽  
Pretreatment Method ◽  
Pcb Congeners

scholarly journals Simple Pretreatment Method for Tritium Measurement in Environmental Water Samples using a Liquid Scintillation Counter

2021 ◽  
Vol 16 (0) ◽  
pp. 2405035-2405035
Author(s):  
Shunya NAKASONE ◽  
Sumi YOKOYAMA ◽  
Tomoyuki TAKAHASHI ◽  
Masakazu OTA ◽  
Hideki KAKIUCHI ◽  
...  
Keyword(s):  
Water Samples ◽  
Liquid Scintillation ◽  
Scintillation Counter ◽  
Environmental Water ◽  
Environmental Water Samples ◽  
Liquid Scintillation Counter ◽  
Pretreatment Method

Flux of PCBs into Water in Little Lake, Peterborough, Ontario

1993 ◽  
Vol 28 (2) ◽  
pp. 495-512 ◽  
Author(s):  
C.D. Metcalfe ◽  
M.L. Ferguson ◽  
T.L. Metcalfe
Keyword(s):  
Lake Sediments ◽  
Water Samples ◽  
Contaminated Sediments ◽  
Total Flux ◽  
Pcb Congeners ◽  
Microcosm Study ◽  
Laboratory Microcosm ◽  
History Of ◽  
Calculated Flux

Abstract The Otonabee River downstream of Peterborough, Ontario, has been contaminated with PCBs as a result of a history of industrial discharges into Little Lake. It has been suggested that downstream sites have become contaminated as a result of desorption of PCBs from contaminated Little Lake sediments, In a laboratory microcosm study, the PCB flux from Little Lake sediments into water was calculated to be 0.4 µg/m2/d, which, when extrapolated to the sediment area of Little Lake, corresponds to a total PCB flux of 0.09 g/d. However, from analysis of water samples upstream and downstream of Little Lake, the total flux of PCBs from Little Lake was calculated to be 13.2 g/d. This discrepancy between calculated flux rates indicates that either the laboratory microcosm study underestimated PCB flux, or there is another source of PCBs in Little Lake other than contaminated sediments. The preponderance of highly chlorinated PCB congeners in water samples collected downstream of Little Lake lends support to the latter hypothesis.

Rotation mixing-assisted liquid–liquid microextraction: a new microextraction approach for the determination of priority phenols in water samples

2016 ◽  
Vol 8 (15) ◽  
pp. 3123-3131 ◽  
Author(s):  
Hasan Çabuk ◽  
Şevket Ata
Keyword(s):  
Liquid Chromatography ◽  
Water Samples ◽  
Sample Pretreatment ◽  
Ultraviolet Detection ◽  
Pretreatment Method ◽  
Liquid Microextraction

In this study, a new sample pretreatment method termed as rotation mixing-assisted liquid–liquid microextraction combined with liquid chromatography with ultraviolet detection was developed for the determination of selected priority phenols in water samples.

Analysis of 60 PCB congeners in drinkable water samples at 10–50 pg/L level

2005 ◽  
Vol 79 (1-2) ◽  
pp. 193-199 ◽  
Author(s):  
Luigi Turrio-Baldassarri ◽  
Annalisa Abballe ◽  
Marialuisa Casella ◽  
Alessandro di Domenico ◽  
Nicola Iacovella ◽  
...  
Keyword(s):  
Water Samples ◽  
Pcb Congeners ◽  
Drinkable Water

Measurements of Dissolved Organic Nitrogen in Wastewater Samples with Nanofiltration Pretreatment

2013 ◽  
Vol 742 ◽  
pp. 359-362
Author(s):  
Chao Jie Zhang ◽  
Xiao Yun Zhao ◽  
Xing Xing Qi ◽  
Qian Chen ◽  
Qi Zhou
Keyword(s):  
Water Samples ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Inorganic Nitrogen ◽  
Operating Time ◽  
Sewage Water ◽  
Pretreatment Method ◽  
Total Dissolved Nitrogen ◽  
Improved Performance ◽  
Wastewater Samples

Conventional dissolved organic nitrogen (DON) measurements for water samples with high dissolved inorganic nitrogen (DIN) to total dissolved nitrogen (TDN) ratio are incorrect due to the cumulative analytical errors of independently measured nitrogen species (DIN and TDN). In this study, we present a nanofiltration (NF) pretreatment to increase the accuracy and precision of DON measurements by selectively concentrating DON while passing through DIN species in water samples to reduce the DIN/TDN ratio. Compared to the available dialysis pretreatment method, the NF pretreatment method shows a similar improved performance for DON measurement for aqueous samples and can save at least 20 h of operating time and a large volume of deionized water, which is beneficial for laboratories involved in DON analysis. To prove the feasibility of the pretreatment, we collected and compared effluent samples from two sewage water treatment plants. The result shows that with the pretreatment, the DIN to TDN ratio has significantly decreased while the dissolved organic carbon (DOC) recovery has been increased. So this NF pretreatment is available.

Pollutant Identification by Selected Area Electron Diffraction

1974 ◽  
Vol 32 ◽  
pp. 532-533
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson ◽  
C. W. Walker
Keyword(s):  
Thermal Treatment ◽  
Electron Diffraction ◽  
Sample Preparation ◽  
Crystal Structures ◽  
Water Samples ◽  
Environmental Samples ◽  
Short Review ◽  
Selected Area Electron Diffraction ◽  
Multiple Component

Selected area electron diffraction (SAD) has been used successfully to determine crystal structures, identify traces of minerals in rocks, and characterize the phases formed during thermal treatment of micron-sized particles. There is an increased interest in the method because it has the potential capability of identifying micron-sized pollutants in air and water samples. This paper is a short review of the theory behind SAD and a discussion of the sample preparation employed for the analysis of multiple component environmental samples.

Enumeration and Identification of Asbestos Fibres in Water

1974 ◽  
Vol 32 ◽  
pp. 526-527 ◽  
Author(s):  
O. Mudroch ◽  
J. R. Kramer
Keyword(s):  
Water Supply ◽  
Water Samples ◽  
Drainage Basin ◽  
Lake Superior ◽  
Research Work ◽  
List Type ◽  
The West ◽  
Asbestos Fibre ◽  
Amphibole Asbestos

Approximately 60,000 tons per day of waste from taconite mining, tailing, are added to the west arm of Lake Superior at Silver Bay. Tailings contain nearly the same amount of quartz and amphibole asbestos, cummingtonite and actinolite in fibrous form. Cummingtonite fibres from 0.01μm in length have been found in the water supply for Minnesota municipalities.The purpose of the research work was to develop a method for asbestos fibre counts and identification in water and apply it for the enumeration of fibres in water samples collected(a) at various stations in Lake Superior at two depth: lm and at the bottom.(b) from various rivers in Lake Superior Drainage Basin.

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