Preservation of some trace metals in samples of natural waters

Subramanian, K. S.; Chakrabarti, Chuni L.; Sueiras, J.E.; Maines, I. S.

doi:10.1021/ac50025a022

Cited by 122 publications

(28 citation statements)

References 23 publications

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“…Post oxidation of the Hg samples and acidification of the trace element samples to a pH <1.5 prohibits absorptive loss to the container walls (Subramanian et al, 1978;Scudlark et al, 1991). The sampling trains were supported in the UM Modified MIC-B collector by a UM custom-built acrylic insert.…”

Section: Wet Deposition Samplingmentioning

confidence: 99%

Long-term Atmospheric Mercury Wet Deposition at Underhill, Vermont

2005

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Section 112(m) of the 1990 Clean Air Act Amendments, referred to as the Great Waters Program, mandated an assessment of atmospheric deposition of hazardous air pollutants (HAPs) to Lake Champlain. Mercury (Hg) was listed as a priority HAP and has continued to be a high priority for a number of national and international programs. An assessment of the magnitude and seasonal variation of atmospheric Hg levels and deposition in the Lake Champlain basin was initiated in December 1992 which included event precipitation collection, as well as collection of vapor and particle phase Hg in ambient air. Sampling was performed at the Proctor Maple Research Center in Underhill Center, VT. The range in the annual volume-weighted mean concentration for Hg in precipitation was 7.8-10.5 ng/l for the 11-year sampling period and the average amount of Hg deposited with each precipitation event was 0.10 microg/m2. The average amount of Hg deposited through precipitation each year from 1993 to 2003 was 9.7 microg/m2/yr. A seasonal pattern for Hg in precipitation is clearly evident, with increased Hg concentrations and deposition observed during spring and summer months. While a clear trend in the 11-year event deposition record at Underhill was not observed, a significant decrease in the event max-to-monthly ratio was observed suggesting that a major source influence was controlled over time. Discrete precipitation events were responsible for significant fractions of the monthly and annual loading of Hg to the forested ecosystem in Vermont. Monthly-averaged temperatures were found to be moderately correlated with monthly volume-weighted mean Hg concentrations (r2 = 0.61) and Hg deposition (r2 = 0.67) recorded at the Vermont site. Meteorological analysis indicated the highest levels of Hg in precipitation were associated with regional transport from the west, southwest, and south during the warmer months.

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Section: Wet Deposition Samplingmentioning

confidence: 99%

Long-term Atmospheric Mercury Wet Deposition at Underhill, Vermont

2005

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“…the sheer volume of samples might overstretch the 1''''11.1'. 4 54 have demonstrated that. whilst at low pH (below 2,5) pyrex and plastic (Nalgene) tubes adsorb no aluminium.…”

Section: Aluminium Monitoring Programmes and Their Implicationsmentioning

confidence: 99%

Aluminium in Renal Disease: Current Knowledge and Future Developments

Starkey

1987

Ann Clin Biochem

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h .7 findings supported by more recent studies.x Thirdly. several studies": lit have shown that serum and tissue aluminium concentrations arc elevated in dialysis encephalopathy. In one such study" the mean serum aluminium concentration in 47 haemodialysis patients was three times that in normal subjects; the value found in J() patients with dialysis encephalopathy. however. excecded normal concentrations by a factor of 10. Similarly. brain aluminium concentrations in DES have been shown to be much higher than those of dialysis patients without encephalopathy. or non-uraemic subjects. lit. II

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“…The pH of Turlock Lake water falls in the range 6.0 to 6.8. The data of Subramanian et al (1978) show that in this pH range the rate of absorptive loss of Pb on the container wall might be significant, whereas no losses were observed by them at a pH of 1.6. However, there was no significant loss of Pb onto the container walls for our unacidified samples during the interval between sampling and analysis (Table I), and the Pb concentration of a solution containing 10 ppb Pb in Milli-Q water in a pre-treated sample bottle remained unchanged for several days.…”

Section: Lake Water Analysismentioning

confidence: 78%

“…The calctflation was based on the assumption thatA(Pb), the rise in the Pb level of the Lake water, came entirely from the combustion of gasoline and that all of the Pb in the exhaust gases was absorbed by the water. The calculation was made using some typical average data: A(Pb)= 0.5 ppb, Lake volume = 25,000 acre-feet (3.1 x 101° 1), and the Pb content of gasoline was taken to be 0.66 g of Pb 1 -t of gasoline (Wheeler et al, 1978). The result is that approximately 6.0 x 103 gallons of gasoline would have to be burned in order to obtain the observedz3(Pb).…”

Section: Plug Flow Modelmentioning

confidence: 99%

The temporal variations of lead concentration in a freshwater lake

Byrd

1980

Water Air Soil Pollut

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Abstract. The temporal and spatial variations in the Pb concentration of a freshwater recreational lake were determined, and the results compared with daily records of lake volume, residence time and number of boats launched. In addition, laboratory studies were carried out to establish the influence of sediment-water interactions on the Pb concentration of the lake water. The variation in the Pb concentration in the main body of the lake was found to correlate with the lake volume. This fact, together with the laboratory studies and calculations based on a plug flow model, suggests that sediment-water interactions are significant in controlling the Pb concentration in the main body of the lake. On the other hand, boating was found to be important in controlling the Pb concentration in the boat dock area. The water in this area is subjected to both poor mixing and heavy boat traffic.

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Preservation of some trace metals in samples of natural waters

Cited by 122 publications

References 23 publications

Long-term Atmospheric Mercury Wet Deposition at Underhill, Vermont

Long-term Atmospheric Mercury Wet Deposition at Underhill, Vermont

Aluminium in Renal Disease: Current Knowledge and Future Developments

The temporal variations of lead concentration in a freshwater lake

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