Microprecipitation and δ 18 O analysis of phosphate for paleoclimate and biogeochemistry research

Mine, Aric H.; Waldeck, Anna R.; Olack, Gerard; Hoerner, Marie E.; Alex, Sobolev; Colman, Albert S.

doi:10.1016/j.chemgeo.2017.03.032

Cited by 23 publications

(37 citation statements)

References 42 publications

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“…The CAS is defined here as a deep oceanic connection between the Pacific and Atlantic oceans along the tectonic boundary of the Caribbean and South American plates (Jaramillo et al, 2017). The CAS existed throughout the Cenozoic, but was reduced in width by the early Miocene (Farris et al, 2011), and the transfer of deep water ceased by the late Miocene 12-10 Ma (Montes et al, 2015;Bacon et al, 2015;Jaramillo et al, 2017). Shallow marine connections between Caribbean and Pacific waters existed until about 4.2-3.5 Ma, when a complete closure occurred (Coates and Stallard, 2013).…”

Section: Introductionmentioning

confidence: 99%

Neogene Caribbean elasmobranchs: diversity, paleoecology and paleoenvironmental significance of the Cocinetas Basin assemblage (Guajira Peninsula, Colombia)

Carrillo-Briceño

Luz²,

Hendy

et al. 2019

Biogeosciences

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Abstract. The Cocinetas Basin is located on the eastern flank of the Guajira Peninsula, northern Colombia (southern Caribbean). During the late Oligocene through the Pliocene, much of the basin was submerged. The extensive deposits in this area suggest a transition from a shallow marine to a fluvio-deltaic system, with a rich record of invertebrate and vertebrate fauna. The elasmobranch assemblages of the early Miocene to the late Pliocene succession in the Cocinetas Basin (Jimol, Castilletes and Ware formations, as well as the Patsúa Valley) are described for the first time. The assemblages include at least 30 taxa of sharks (Squaliformes, Pristiophoriformes, Orectolobiformes, Lamniformes and Carcharhiniformes) and batoids (Rhinopristiformes and Myliobatiformes), of which 24 taxa are reported from the Colombian Neogene for the first time. Paleoecological interpretations are based on the feeding ecology and on estimates of the paleohydrology (relative salinity, temperature) using stable isotope compositions of oxygen in the bioapatite of shark teeth. The isotopic composition of the studied specimens corroborates paleoenvironmental settings for the studied units that were previously estimated based on the sedimentology and biology of the taxa. These Neogene elasmobranch assemblages from the Cocinetas Basin provide new insights into the diversity the sharks and rays inhabiting the coastal and estuarine environments of the northwestern margin of South America, both during the existence of the gateway between the Atlantic and Pacific oceans and following its closure.

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Section: Introductionmentioning

confidence: 99%

Neogene Caribbean elasmobranchs: diversity, paleoecology and paleoenvironmental significance of the Cocinetas Basin assemblage (Guajira Peninsula, Colombia)

Carrillo-Briceño

Luz²,

Hendy

et al. 2019

Biogeosciences

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“…In addition to the issue of organic matter, silver oxide was found in the silver phosphate when using the method of microprecipitation to prepare phosphate [ 23 ]. Rapid microprecipitation has been widely used in silver phosphate precipitation [ 26 ], though the pH range of its solution system is controversial [ 27 ]. An improved rapid microprecipitation has been proposed by Mine et al [ 27 ] to resolve the problems of incomplete precipitation of phosphate and the production of silver oxide contaminants during the preparation of silver phosphate from bioapatites, though it is not suitable for samples of soils and sediments.…”

Section: Introductionmentioning

confidence: 99%

Improvements in the preparation of phosphate for oxygen isotope analysis from soils and sediments

Huang

Yin

2018

PLoS ONE

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In contrast to the successful preparation of phosphate for oxygen isotope analysis from water samples, there are still a series of problems for similar analyses from soils and sediments. Here, we improved and optimized the methods of silver phosphate preparation for oxygen isotope analysis from soils and sediments. During our preparations, organic matter was removed by sodium hypochlorite and XAD-2 resin, while the impurities of elemental silver and its oxide were removed by rapid microprecipitation and ammonium phospho-molybdate and magnesium ammonium phosphate. The total organic carbon and total nitrogen in the prepared silver phosphates from soils and sediments were 0.226±0.033% and 0.030±0.0059% (n = 7), 0.217±0.053% and 0.034±0.0120% (n = 9), respectively, indicating a high removal efficiency of organic matter. We confirmed that adding citric acid during rapid microprecipitation would introduce the impurity of elemental silver, which could be removed by ammonia recrystallization. The pH range of solutions for rapid microprecipitation was optimized at 7.0‒7.5. Results of X-ray Diffraction and stable oxygen isotope analyses showed that the improved method could obtain high pure silver phosphate from soil and sediment samples without oxygen isotope fractionation. This improved procedure provides a foundation for biogeochemical studies on phosphorus in soil and lacustrine environments by using phosphate oxygen isotopes.

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“…Traditionally, silver phosphate precipitation methods are lengthy and/or require a relatively large sample size . Our simplified method for Ag 3 PO 4 precipitation combines key attributes from previously published studies by O'Neil et al, Stephan, and Wiedemann‐Bidlack et al, while reducing the number of steps and the length of time required to produce organic‐free, pure Ag 3 PO 4 from bioapatite without compromising the reproducibility of the δ 18 O values.…”

Section: Discussionmentioning

confidence: 99%

“…Traditionally, silver phosphate precipitation methods are lengthy and/ or require a relatively large sample size. 29,30,[33][34][35][36][40][41][42][43] Our simplified method for Ag 3 PO 4 precipitation combines key attributes from previously published studies by O'Neil et al, 30 Stephan, 33 and…”

Section: Discussionmentioning

confidence: 99%

“…The importance and versatility of using Ag 3 PO 4 for oxygen isotope studies have led to the development of numerous methods for Ag 3 PO 4 extraction. [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] These techniques vary drastically in the required sample size (e.g., 1 mg to ≥30 mg), organic material removal treatments, chemical isolation of Ag 3 PO 4 , and analytical protocols (e.g., lasting at least 3 days and using up to 10 different solutions and reagents). [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] Therefore, the objective of this study is to develop a simplified extraction method for precipitating pure, organic-free Ag 3 PO 4 from small sample sizes of bioapatite (~5 mg).…”

Section: −mentioning

confidence: 99%

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A simplified silver phosphate extraction method for oxygen isotope analysis of bioapatite

Shabaga

Gough

Fayek

et al. 2018

Rapid Comm Mass Spectrometry

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Microprecipitation and δ 18 O analysis of phosphate for paleoclimate and biogeochemistry research

Cited by 23 publications

References 42 publications

Neogene Caribbean elasmobranchs: diversity, paleoecology and paleoenvironmental significance of the Cocinetas Basin assemblage (Guajira Peninsula, Colombia)

Neogene Caribbean elasmobranchs: diversity, paleoecology and paleoenvironmental significance of the Cocinetas Basin assemblage (Guajira Peninsula, Colombia)

Improvements in the preparation of phosphate for oxygen isotope analysis from soils and sediments

A simplified silver phosphate extraction method for oxygen isotope analysis of bioapatite

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