Dose-dependent effects of lead and cadmium and the influence of soil properties on their uptake by Helix aspersa: an ecotoxicity test approach

Abstract To determine the association between hearing loss and environmental lead, cadmium, and selenium exposure, a total of 1503 American adults from National Health and Nutrition Examination Survey (NHANES) (2011∼2012) were assessed. The average of 4 audiometric frequencies (0.5, 1, 2, and 4 kHz) was used to identify speech-frequency hearing loss (SFHL), while the average of 3 audiometric frequencies (3, 4, and 6 kHz) was used to identify high-frequency hearing loss (HFHL). HFHL adjusted Odds ratios (ORs) determined by comparing the highest and lowest blood lead and cadmium quartiles were 1.98 (95%CI: 1.27, 3.10) and 1.81 (95%CI: 1.13, 2.90), respectively. SFHL was significant associated with blood cadmium with the OR = 2.42 for the highest quartile. When further stratified by age, this association appeared to be limited to adults aged 35-52 years. After stratified by gender, except for lead and cadmium, we observed that blood selenium showed a dose-dependent association with SFHL in men. In women, only cadmium showed a dose-dependent association with speech and high frequency hearing loss. Hearing loss was positively associated with blood levels of lead and cadmium. Additionally, our study provided novel evidence suggesting that excessive selenium supplement would increase SFHL risk in men.

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Biosorption Potentials of Pleurotus tuber-regium (Fr.) Sing in Lead and Cadmium Polluted Soil

10.54117/jpmesc.v1i1.1 ◽

2022 ◽

Vol 1 (1) ◽

pp. 1-3

Author(s):

O.C.U. Adumanya ◽

◽

B.C. Onwubuche ◽

S.A. Nwinee ◽

G.A. Umensofor ◽

...

Keyword(s):

Lead Concentration ◽

Environmental Pollutants ◽

Polluted Soil ◽

Soil Samples ◽

Distilled Water ◽

Intrinsic Properties ◽

Lead And Cadmium ◽

Ad Libitum ◽

Dose Dependent ◽

Humus Soil

Background/Aim: The heavy metals, cadmium (Cd) and lead (Pb), are often implicated as environmental pollutants. Therefore, the biosorption potential of Pleurotus tuber-regium in lead and cadmium polluted soil was investigated by this work. Methods: Four kilograms of each humus soil sample was weighed into eight different black nursery cellophane bags and polluted with 0.5 g, 1.0 g and 2.0 g of lead and cadmium in triplicate. Pleurotus sclerotia were then planted in these polluted soil samples, and distilled water was added ad libitum. Results: The results showed that the growth performance was dose-related in lead-polluted soil. The Pleurotus tuber regium mushroom in the lead-polluted soil samples indicated a dose-dependent absorbed lead concentration in the results. Cadmium-polluted soil samples did not support the growth of the Pleurotus tuber regium mushroom at the various concentrations of cadmium used after day 30. Therefore, the findings suggest that the Pleurotus tuber regium mushroom and its sclerotia have intrinsic properties for the absorption of lead and cadmium. Conclusion: The findings suggest that the Pleurotus tuber regium mushroom and its sclerotia have intrinsic properties for the absorption of lead and cadmium.

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Characterization of lead-bearing phases in municipal waste combustor fly ash

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100165045 ◽

1996 ◽

Vol 54 ◽

pp. 516-517

Author(s):

L. L. Sutter ◽

G. R. Dewey ◽

J. F. Sandell

Keyword(s):

Fly Ash ◽

Bottom Ash ◽

Municipal Waste ◽

Primary Concern ◽

Leaching Behavior ◽

Waste Combustion ◽

Lead And Cadmium ◽

Lead Speciation ◽

Accepted Practice

Municipal waste combustion typically involves both energy recovery as well as volume reduction of municipal solid waste prior to landfilling. However, due to environmental concerns, municipal waste combustion (MWC) has not been a widely accepted practice. A primary concern is the leaching behavior of MWC ash when it is stored in a landfill. The ash consists of a finely divided fly ash fraction (10% by volume) and a coarser bottom ash (90% by volume). Typically, MWC fly ash fails tests used to evaluate leaching behavior due to high amounts of soluble lead and cadmium species. The focus of this study was to identify specific lead bearing phases in MWC fly ash. Detailed information regarding lead speciation is necessary to completely understand the leaching behavior of MWC ash.

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