Humic acid as a preservative for trace mercury(II) solutions stored in polyolefin containers

Heiden, Richard W.; Aikens, D. A.

doi:10.1021/ac00264a029

Cited by 17 publications

(7 citation statements)

References 36 publications

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“…All the previously described experiments were carried out in distilled water. Obviously, actual measurements to determine complexation behavior were performed in the presence of humic substances, which can stabilize mercury solutions and prevent adsorptive losses (37). In fact, the recovery of methylmercury(II) in humic solutions after 24 h is close to 100% even at very dilute methylmercury(II) concentrations as illustrated in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Measurement of Complexation of Methylmercury(II) Compounds by Freshwater Humic Substances Using Equilibrium Dialysis

Hintelmann

Welbourn

Evans

1997

Environ. Sci. Technol.

134

106

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Humic and fulvic acids from lakes in Ontario, Canada, have been isolated and been examined for their ability to bind methylmercury(II). Equilibrium dialysis has been applied to differentiate between bound and unbound fractions of MeHg(II). Losses of methylmercury(II) from solutions containing 0.5-100 ng/L MeHg(II) and 10 mg/L humic substances (HS) are negligible over a 24-h time interval when using acid-cleaned glass beakers, membrane closures, and cellulose ester membranes having a molecular weight cutoff of 500. Dialysis equilibrium for MeHg(II) is reached within this period of time. For each humic material, two classes of binding sites could be detected. Log K values of conditional stability constants for the strong and the weaker binding sites were in the range of 13.02-14.48 and 12.15-13.07, respectively. Binding capacities have been calculated as 0.2-13 of ng MeHg(II)/mg of HS for the strong sites and 1.2-72 ng of MeHg(II)/mg of HS for the weaker sites. Calculation of equilibrium distribution shows that methylmercury(II)-HS complexes predominate in oxidized freshwaters with low sulfide concentrations. In anoxic waters, CH 3 HgSH should prevail. The CH 3 HgCl complex is too weak to compete with either of the latter complexes.

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Section: Resultsmentioning

confidence: 99%

Measurement of Complexation of Methylmercury(II) Compounds by Freshwater Humic Substances Using Equilibrium Dialysis

Hintelmann

Welbourn

Evans

1997

Environ. Sci. Technol.

134

106

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“…Humic acid is a complex organic substance that strongly binds a number of multivalent metal ions. Heiden and Aikens (1983) found it to be the most effective preservative for Hg (II) at the 1-.ig/L level for distilled water solutions stored in polyethylene containers. Other preservatives tested included 1 percent HNO3 and 5 percent HNO3 + 0.05 percent K2Cr2O7.…”

Section: Humic Acidmentioning

confidence: 96%

PRESERVATION OF SAMPLES FOR DISSOLVED MERCURY¹

Hamlin

1989

J American Water Resour Assoc

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Water samples for dissolved mercury require special treatment because of the high chemical mobility and volatility of this element. Widespread use of mercury and its compounds has provided many avenues for contamination of water. Two laboratory tests were done to determine the relative permeabilities of glass and plastic sample bottles to mercury vapor. Plastic containers were confirmed to be quite permeable to airborne mercury, glass containers were virtually impermeable. Methods of preservation include the use of various combinations of acids, oxidants, and complexing agents. The combination of nitric acid and potassium dichromate successfully preserved mercury in a large variety of concentrations and dissolved forms. Because this acid‐oxidant preservative acts as a sink for airborne mercury and plastic containers are permeable to mercury vapor, glass bottles are preferred for sample collection. To maintain a healthy work environment and minimize the potential for contamination of water samples, mercury and its compounds are isolated from the atmosphere while in storage. Concurrently, a program to monitor environmental levels of mercury vapor in areas of potential contamination is needed to define the extent of mercury contamination and to assess the effectiveness of mercury clean‐up procedures.

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“…[55][56][57][58][59][60][61][62][63][64] Several workers have discussed the storage of samples in polyethylene containers. [55][56][57][58][59][60][61][62][63][64] Several workers have discussed the storage of samples in polyethylene containers.…”

Section: Preservation Of Mercury-containing Samplesmentioning

confidence: 99%

“…59 It has also been found that pretreatment of polyethylene bottles with chloroform suppresses losses from stored 1 μg L −1 mercury solutions in natural and distilled water. A relationship has been found between compositional differences in different sources of commercial polyethylene bottles and the stability of mercury solutions stored therein.…”

Section: Preservation Of Mercury-containing Samplesmentioning

confidence: 99%

Water Sample Preservation

Crompton

2015

Determination of Metals in Natural Waters, Sediments and Soils

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Humic acid as a preservative for trace mercury(II) solutions stored in polyolefin containers

Cited by 17 publications

References 36 publications

Measurement of Complexation of Methylmercury(II) Compounds by Freshwater Humic Substances Using Equilibrium Dialysis

Measurement of Complexation of Methylmercury(II) Compounds by Freshwater Humic Substances Using Equilibrium Dialysis

PRESERVATION OF SAMPLES FOR DISSOLVED MERCURY¹

Water Sample Preservation

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Humic acid as a preservative for trace mercury(II) solutions stored in polyolefin containers

Cited by 17 publications

References 36 publications

Measurement of Complexation of Methylmercury(II) Compounds by Freshwater Humic Substances Using Equilibrium Dialysis

Measurement of Complexation of Methylmercury(II) Compounds by Freshwater Humic Substances Using Equilibrium Dialysis

PRESERVATION OF SAMPLES FOR DISSOLVED MERCURY1

Water Sample Preservation

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PRESERVATION OF SAMPLES FOR DISSOLVED MERCURY¹