Assessment of the 1% Na2CO3 technique to quantify the phytolith pool

摘要: Amorphous silica (ASi) pool and fluxes have become parameters of a growing interest in the understanding biogeochemical cycle Si modeling anthropogenic impacts. Extraction by 1% Na2CO3 followed correction for crystalline (DeMaster, 1981) has recently widely used is proposed as standard technique quantifying amorphous pools soil continental aquatic environments. However, method was developed to quantify diatom frustules not phytoliths (PhSi), which constitute most common fraction ASi soils. The aim this study assess fresh aged phytoliths. We founded significant positive correlation between extracted other procedures (Guntzer et al., 2010) various shoot samples (elm, horsetail, fern larch). Because are mainly composed phytoliths, we concluded that well adapted determination PhSi containing less than 70 mg g(-1). To artificial mixtures from La Reunion (Meunier at, 1999) quartz. Our results showed underestimated factor 3.7. Combining physical extraction using origins dispersion data can be explained combination several factors including loss during presence resistant In absence technique, recommend check nature particles with order provide more careful analysis ASi. (C) 2013 Elsevier B.V. All rights reserved.