The Distribution of Toxic and Essential Metals in the Florida Everglades

Duan, Zhipeng

doi:10.25148/etd.fi12080608

Cited by 4 publications

(3 citation statements)

References 97 publications

(119 reference statements)

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“…The relationship between high arsenic content within organic rich soils, commonly occurring in wetlands, was further confirmed in a study of Everglades peats by Duan [ 71 ] who found that the mean dry season arsenic concentration in soils was 2.82 ± 1.97 mg/kg and in the wet season was 3.13 ± 2.77 mg/kg. The Duan [ 71 ] research is consistent with that of Chen [ 67 ] and Ma et al [ 66 ], where he found arsenic concentrations in excess of 50 mg/kg in calcareous endisols. The concentrations in the flocs were higher and in the periphyton were slightly lower ( Table 3 ).…”

Section: Naturally Occurring Arsenic Concentrations In Sediments Amentioning

confidence: 59%

Natural Background and Anthropogenic Arsenic Enrichment in Florida Soils, Surface Water, and Groundwater: A Review with a Discussion on Public Health Risk

Missimer

Teaf

Beeson³

et al. 2018

IJERPH

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Florida geologic units and soils contain a wide range in concentrations of naturally-occurring arsenic. The average range of bulk rock concentrations is 1 to 13.1 mg/kg with concentrations in accessary minerals being over 1000 mg/kg. Florida soils contain natural arsenic concentrations which can exceed 10 mg/kg in some circumstances, with organic-rich soils often having the highest concentrations. Anthropogenic sources of arsenic have added about 610,000 metric tons of arsenic into the Florida environment since 1970, thereby increasing background concentrations in soils. The anthropogenic sources of arsenic in soils include: pesticides (used in Florida beginning in the 1890’s), fertilizers, chromated copper arsenate (CCA)-treated wood, soil amendments, cattle-dipping vats, chicken litter, sludges from water treatment plants, and others. The default Soil Cleanup Target Level (SCTL) in Florida for arsenic in residential soils is 2.1 mg/kg which is below some naturally-occurring background concentrations in soils and anthropogenic concentrations in agricultural soils. A review of risk considerations shows that adverse health impacts associated with exposure to arsenic is dependent on many factors and that the Florida cleanup levels are very conservative. Exposure to arsenic in soils at concentrations that exceed the Florida default cleanup level set specifically for residential environments does not necessarily pose a meaningful a priori public health risk, given important considerations such as the form of arsenic present, the route(s) of exposure, and the actual circumstances of exposure (e.g., frequency, duration, and magnitude).

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Section: Naturally Occurring Arsenic Concentrations In Sediments Amentioning

confidence: 59%

Natural Background and Anthropogenic Arsenic Enrichment in Florida Soils, Surface Water, and Groundwater: A Review with a Discussion on Public Health Risk

Missimer

Teaf

Beeson³

et al. 2018

IJERPH

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“…At the start of each breeding season we identified islands with breeding colonies using systematic, 100% coverage aerial and ground surveys and selected 9–10 colonies each year in which to monitor breeding success and Hg exposure. We selected colonies based on location to ensure representation of different ecological conditions within the Everglades and previous Hg exposure to ensure the representation of areas with contrasting Hg concentrations. , A review of studies on heavy metals and persistent organic pollutants (POPs) in Florida birds found no evidence of POP or heavy metal, other than Hg, levels of concern in the study species in the Everglades. − …”

Section: Methodsmentioning

confidence: 99%

Mercury Concentration in Nestling Feathers Better Predicts Individual Reproductive Success than Egg or Nestling Blood in a Piscivorous Bird

Zabala

Rodríguez-Jorquera

Orzechowski

et al. 2019

Environ. Sci. Technol.

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Piscivorous birds are at high risk of mercury exposure in aquatic food webs, and their reproductive success is sensitive to methylmercury exposure. Although effects are convincingly shown in a handful of lab studies, sublethal effects at environmentally relevant concentrations in the field, where there is a range of other natural stressors, are not well delineated. Part of that uncertainty arises because mercury concentration (hereafter, [Hg]) in adult tissues used to assess Hg risk can be influenced by Hg values in wintering grounds or other nonrelated areas. Several studies have used nestling tissues under the assumption that they better represent local risk to breeding since nestlings consume locally derived food. However, the correlation between [Hg] in nestling tissues and local breeding success remains unassessed. We analyzed great egret (Ardea alba) breeding parameters collected over 3 years (2015–2017) in the Everglades (Florida, USA). The Everglades is a large contiguous wetland with geographically dispersed wading bird breeding sites exposed to variable and biologically relevant ranges of mercury concentrations. We examined mercury concentrations in albumen and nestling blood and feathers as predictors of 6 measures of reproductive success at individual nests. Albumen [Hg] did not correlate with reproductive end points, and correlations with blood [Hg] were weak. Feather [Hg] correlated negatively with all of the posthatching endpoints and explained 8.3% of the variance in the probability of a laid egg resulting in a fledged chick. However, most of the observed failures were hatching failures, which were not explained by albumen [Hg], and other nestling tissues could therefore not be evaluated. While our results support the use of nestling feathers as indicators of site-specific mercury exposure, we discuss both advantages and possible limitations of using nestling feathers as indicators of local mercury exposure.

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“…Natural arsenic background (mg/kg) in undisturbed natural surface soils in Miami-Dade County, the Everglades, and Florida. Mean values based on Minimum Variance Unbiased Estimate of the mean (MVUE) for DERM (2000) and (2004), arithmetic mean forDuan (2012), and geometric mean forChen et al (2000) and (2001). Dry season (2.8 mg/kg) and wet season (3.13 mg/kg).…”

mentioning

confidence: 99%

Soil Arsenic in Miami-Dade County

Smyth

Crane

et al. 2021

EDIS

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This new 6-page factsheet provides information about soil arsenic (As) in Miami-Dade County, including basics, background concentrations, cleanup guidelines of soil As, and bioavailability of soil As related to plant and human health. Written by Yuncong Li, Ashley Smyth, Jonathan Crane, Christopher Teaf, and Guangliang Liu, and published by the UF/IFAS Department of Soil and Water Sciences.https://edis.ifas.ufl.edu/ss696

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The Distribution of Toxic and Essential Metals in the Florida Everglades

Cited by 4 publications

References 97 publications

Natural Background and Anthropogenic Arsenic Enrichment in Florida Soils, Surface Water, and Groundwater: A Review with a Discussion on Public Health Risk

Natural Background and Anthropogenic Arsenic Enrichment in Florida Soils, Surface Water, and Groundwater: A Review with a Discussion on Public Health Risk

Mercury Concentration in Nestling Feathers Better Predicts Individual Reproductive Success than Egg or Nestling Blood in a Piscivorous Bird

Soil Arsenic in Miami-Dade County

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