Improved method for removing siderite by in situ acidification before elemental and isotope analysis of soil organic carbon

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F19%3A10394487" target="_blank" >RIV/00216208:11310/19:10394487 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=rIVPEY0aIc" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=rIVPEY0aIc</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/jpln.201800164" target="_blank" >10.1002/jpln.201800164</a>

Result language

angličtina

Original language name

Improved method for removing siderite by in situ acidification before elemental and isotope analysis of soil organic carbon

Original language description

Siderite (FeCO3) is an iron carbonate mineral commonly found in sediments and soils. Similarly to other carbonates, such as calcite or dolomite, it may substantially affect the quantification of organic carbon (C) as well as determination of C isotope ratio of soil organic matter. Both analyses require effective removal of siderite by pretreatment with acid. However, little is known about the siderite removal efficiency of the acid pretreatment methods which have been previously proposed in the literature. In our study, we tested three previously proposed carbonate removal methods for siderite removal in siderite-containing soils. Furthermore, we tested whether siderite C content in a soil sample can be detected as CO2 evolved after H3PO4 addition which would allow organic C determination from the difference between total and inorganic C. None of the three tested pretreatment methods led to sufficient removal of siderite C when applied on siderite alone. Therefore, we developed a new protocol for a 4-day treatment with 10% HCl at 25 degrees C. At siderite content of up to 10 wt.%, the removal efficiency of our method (99-100%) was sufficient both for organic C as well as for C isotope analyses. This was further confirmed with tests on siderite-containing soils. These showed that the method of Larson etal. () developed for sediments is also suitable. However, the new protocol provides advantage in terms of less microplate manipulation, capsule overflow and oven use. We found that CO2 is not evolved 2 minutes after H3PO4 addition from siderite in contrast to calcite and dolomite. This fact can be used for separate quantification of inorganic C from calcite/dolomite and siderite, e.g., in studies of their different role in soil development. We showed that siderite-containing soils require special pretreatment procedure before organic C and C-13/C-12 analyses. We recommend using our protocol if techniques such as XRD or SEM-EDS indicate the presence of siderite in soil.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Plant Nutrition and Soil Science

ISSN

1436-8730

e-ISSN

—

Volume of the periodical

182

Issue of the periodical within the volume

1

Country of publishing house

DE - GERMANY

Number of pages

10

Pages from-to

82-91

UT code for WoS article

000458701100009

EID of the result in the Scopus database

2-s2.0-85056764389