A method for the determination of total Cr(VI) in cement |
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| Affiliation: | 1. Departamento de Química, Universidad Simón Bolívar (USB), Apartado 89000, Caracas 1080 A. Venezuela;2. Escuela “Dr. Jesús María Bianco”, Departamento Químico-Analítico, Cátedra de Química Orgánica I, Facultad de Farmacia, Universidad Central de Venezuela (UCV), Venezuela;1. Department of Orthopaedic Surgery and Traumatology, Obafemi Awolowo University Teaching Hospital Complex, Ile – Ife, Nigeria;3. Department of Orthopaedic Surgery and Traumatology, Obafemi Awolowo University, Ile – Ife, Nigeria;4. Department of Surgery, Obafemi Awolowo University, Ile – Ife, Nigeria;5. Department of Chemical Pathology, Obafemi Awolowo University Teaching Hospital Complex, Ile – Ife, Nigeria;1. Medical Laboratory Techniques, Vocational Higher School of Healthcare Studies, Mardin Artuklu University, 47200 Mardin, Turkey;2. Yıldız Technical University, Art and Science Faculy, Department of Chemistry, Esenler, TR 34220 İstanbul, Turkey;3. Dicle University, Faculty of Science, Department of Chemistry, Laboratory of Chemical Analysis, TR 21280 Diyarbakır, Turkey;4. Middle East Technical University, Faculty of Arts and Sciences, Department of Chemistry, 06800 Ankara, Turkey |
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| Abstract: | Portland cement is often used to solidify wastes in order to prevent heavy metals from eluting, despite the fact that most cements contain traces of soluble Cr(VI). It was found that the leachability of Cr(VI) for the soil stabilized by cement was high in some cases, and the amount of Cr(VI) leached was larger than could be accounted for by the “soluble Cr(VI)” in the cement as determined by the standard method. Since the existing analytical standards only deal with “soluble Cr(VI)” in cement, we had to develop a new procedure to measure the total Cr(VI) in cement, making use of a complete dissolution in acid. Application of this method to several different ordinary Portland cements showed that 50–80% of their total Cr is typically extracted as Cr(VI). We also observed that the interstitial (calcium aluminate/ferrite) phase in Portland cement clinker usually contains higher concentrations of both Cr and Cr(VI) than the calcium silicate phases. |
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