Boron Determination—A Review of Analytical Methods

Sah, R. N.; Brown, Patrick H.

doi:10.1006/mchj.1997.1428

Cited by 206 publications

(151 citation statements)

References 116 publications

(187 reference statements)

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“…However, B can be difficult to measure by ICP-MS, due to (1) spectral overlap of the 12 C peak on the 11 B peak, (2) nebulisation of acidic solutions resulting in high B blank values from the entrance system, and (3) high B concentrations in the sample that may cause memory effects (Al-Ammar et al, 1999Sah and Brown, 1997;. In addition to these technical complexities, preparation of carbonate samples for ICP-MS is time-consuming and meticulous.…”

Section: Introductionmentioning

confidence: 99%

Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific

et al. 2011

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Abstract.A distinct gap in our ability to understand changes in coastal biology that may be associated with recent ocean acidification is the paucity of directly measured ocean environmental parameters at coastal sites in recent decades. Thus, many researchers have turned to sclerochronological reconstructions of water chemistry to document the historical seawater environment. In this study, we explore the relationships between B/Ca and pH to test the feasibility of B/Ca measured on the ion probe as a pH proxy in the California mussel, Mytilus californianus. Heterogeneity in a range of ion microprobe standards is assessed, leading to reproducible B/Ca ratios at the 5 % level. The B/Ca data exhibit large excursions during winter months, which are particularly pronounced during the severe winters of 2004-2005 and 2005-2006. Furthermore, B/Ca ratios are offset in different parts of the skeleton that calcified at the same time. We compare the M. californianus B/Ca record to directly measured environmental data during mussel growth from the period of 1999-2009 to examine whether seawater chemistry or temperature plays a role in controlling shell B/Ca. A suite of growth rate models based on measured temperature are compared to the B/Ca data to optimise the potential fit of B/Ca to pH. Despite sampling conditions that were well-suited to testing a pH control on B/Ca, including a close proximity to an environmental record, a distinct change in pH at the sampling locale, and a growth model designed to optimise the correlations between seawater pH and shell B/Ca, we do not see a strong correlations between pH and shell B/Ca (maximum coefficient of determination, r 2 , of 0.207). Instead, our data indicate a strong biological control on B/Ca as observed in some other carbonate-forming organisms.

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Section: Introductionmentioning

confidence: 99%

Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific

et al. 2011

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“…Naka & Kurayasu (1991) e Karunasagar et al (2000) relatam a volatilização do boro durante a digestão ácida (HF) da matriz de quartzo e propõem o uso de reagentes durante a preparação da amostra para contornar este problema. Por sua vez, Sah & Brown (1997) relatam a perda do boro durante os processos de decomposição e evaporação da amostra, devido à alta volatilidade do BF 3 , que é oriundo dos ataques ácidos. Medidas adicionais em resídu-os da digestão ácida estão previstas para elucidar a presença do boro e buscar evidências sobre a transferência de carga entre íons de Fe 2+ e Ti 4+ , na estrutura da dumortierita no quartzo da PPB.…”

Section: Discussionunclassified

Estudo da suscetibilidade ao escurecimento por radiação gama de quartzo róseo-leitoso da província pegmatítica da Borborema

Miranda

Gonzaga

Guzzo

et al. 2012

Rev. bras. geociênc.

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Revista Brasileira de Geociências 42(2): 293-302, junho de 2012Arquivo digital disponível on-line no site www.sbgeo.org.br 293 ResumoEste estudo considera as transformações induzidas pela radiação γ sobre os defeitos estruturais em quartzo róseo e leitoso da Província Pegmatítica da Borborema (Paraíba e Rio Grande do Norte, Brasil). Amostras de coloração rósea e leitosa foram irradiadas com doses de raios γ ( 60 Co) entre 0,5 e 96 kGy. Defeitos pontuais relacionados às impurezas de Al, Ge, Li e grupos OH foram caracterizados por espectroscopias ultravioleta visível e infravermelha e ressonância paramagnética eletrônica, antes e após a irradiação. A espectrometria de massa com plasma indutivamente acoplado foi empregada para quantificar as concentrações de Al, Li, Ge, Fe, Ti e outras impurezas em fragmentos de diferentes tonalidades. 0 e o consequente escurecimento das amostras foi semelhante para ambos os tipos de quartzo. Análises preliminares por microscopia eletrônica mostraram a presença de fibras nanométricas apenas no resíduo da digestão ácida de amostras róseas, indicando que a coloração rósea do quartzo da Província Pegmatítica da Borborema está provavelmente relacionada às inclusões de dumortierita.Palavras-chave: quartzo natural; pegmatito granítico; radiação ionizante; espectroscopia; defeitos pontuais. Abstract Impurity-related point defects and gamma-radiation response of massive quartz from the Borborema pegmatite province, in Brazil.This work has investigated the changes induced by γ-radiation on impurity-related point defects in massive rose quartz from one deposit located at The Borborema Pegmatite Province (Northeast Region, in Brazil). Samples extracted from rose and colorless (milky) quartz blocks were irradiated with doses of 60 Co, from 0.5 to 96 kGy. Point defects related to Al, Ge, Li and OH were measured by optical, infrared, and electron paramagnetic resonance spectroscopy, prior and after irradiation. The contents of Al, Li, Ge, Fe, Ti and other impurities were measured by inductively-coupled plasma mass spectrometry in quartz fragments exhibiting rose, pale-rose, and milky colorations. 0 content with γ doses and the consequent rise in the intensity of smoky color were similar for both rose and colorless quartz. Scanning electron microscopy carried out in insoluble residues obtained after chemical dissolution of each type of quartz revealed the presence of nanometric fibers only in rose specimens. These results suggested that the cause of rose color in massive quartz from Borborema Pegmatite Province is probably related to the presence of dumortierite inclusions.

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“…8 Both non-destructive analysis (NDA) and destructive analysis (DA) methods were reported for boron analysis. [9][10][11] For boron analysis at trace-level concentrations, DA methods based on wet chemistry is preferred over the ND methods due to their high sensitivity, whereas the ND techniques are used in determining boron at the percentile level. The separation of boron from the matrix prior to the instrumental analysis is a prerequisite in DA methods, whereas NDA methods offer direct analysis of the sample.…”

Section: Introductionmentioning

confidence: 99%

Separation of Boron from Borated Paraffin Wax by Pyrohydrolysis and Alkali Extraction Methods and Its Determination Using Ion Chromatography

et al. 2015

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A method based on the pyrohydrolysis extraction of boron and its quantification with ion chromatography was proposed for paraffin waxes borated with H3BO3 and B4C. The optimum pyrohydrolysis conditions were identified. Wax samples were mixed with U3O8, which prevents the sample from flare up, and also accelerates the extraction of boron. Pyrohydrolysis was carried out with moist O2 at 950 C for 60 and 90 min for wax with H3BO3 and wax with B4C, respectively. Two simple methods of separation based on alkali extraction and melting wax in alkali were also developed exclusively for wax with H3BO3. In all the separations, the recovery of B was above 98%. During IC separation, B was separated as boron-mannitol anion complex. Linear calibration was obtained it between 0.1 and 50 ppm of B, and LOD was calculated as 5 ppb (S/N = 3). The reproducibility was better than 5% (RSD).

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Boron Determination—A Review of Analytical Methods

Cited by 206 publications

References 116 publications

Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific

Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific

Estudo da suscetibilidade ao escurecimento por radiação gama de quartzo róseo-leitoso da província pegmatítica da Borborema

Separation of Boron from Borated Paraffin Wax by Pyrohydrolysis and Alkali Extraction Methods and Its Determination Using Ion Chromatography

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Boron Determination—A Review of Analytical Methods

Cited by 206 publications

References 116 publications

Exploring B/Ca as a pH proxy in bivalves: relationships between &lt;I&gt;Mytilus californianus&lt;/I&gt; B/Ca and environmental data from the northeast Pacific

Exploring B/Ca as a pH proxy in bivalves: relationships between &lt;I&gt;Mytilus californianus&lt;/I&gt; B/Ca and environmental data from the northeast Pacific

Estudo da suscetibilidade ao escurecimento por radiação gama de quartzo róseo-leitoso da província pegmatítica da Borborema

Separation of Boron from Borated Paraffin Wax by Pyrohydrolysis and Alkali Extraction Methods and Its Determination Using Ion Chromatography

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Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific

Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific