Effect of FeSO4.7H2O and SnCl2.2H2O added as Chromium (VI) Reducers in Ordinary Portland Cement

Sharma, Devesh K.; Sharma, Rekha

doi:10.13005/ojc/310164

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…Generally chromium gave a peak in range of 5.0 to 6.0 KeV in EDX spectrum (23)(24)(25)(26). In sample S1, this peak appeared at 5.2 KeV in its EDX spectrum (Figure 4), however this appeared as very weak peak after extraction 3.…”

Section: Edx Spectamentioning

confidence: 93%

A new method in estimation of total hexavalent chromium in Portland pozzolan cement

Sharma

2017

Mater. construcc.

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ABSTRACT:Variamine blue was used first time for the detection of hexavalent chromium from cement samples. In present method, cement was treated sequentially with water, sulphate and carbonate buffer to extract soluble, sparingly soluble and insoluble hexavalent chromium respectively. Extracted Cr (VI) was determined using variamine blue as chromogenic reagent. The determination is based on the reaction of hexavalent chromium with potassium iodide in an acid medium to liberate iodine. This oxidizes variamine blue to form a violet coloured species having an absorption to maximum at 556 nm. Energy-dispersive X-ray spectroscopy (EDX) and Infrared Spectroscopy (IR) confirmed the complete extraction of hexavalent chromium by sequential extraction process. SRM 2701 (Reference material from NIST, USA) was used for revalidating the results. The percentage of recovery for proposed and reference method (diphelycarbazide method) varied from 98.5 to 101 and 97.5 to 100.5. Whereas, their relative error percentage varied from -1.5 to 0.33 and -2.5 to 0.5. RESUMEN:Un nuevo método en la determinación del cromo hexavalente total en cemento Portland puzolánico. El azul de variamina se utilizó por primera vez para la detección de cromo hexavalente en muestras de cemento. En el presente método, el cemento se trató secuencialmente con agua, y tampones sulfato y carbonato para extraer el cromo hexavalente soluble, poco soluble e insoluble, respectivamente. El Cr (VI) extraído se determinó utilizando azul de variamina como reactivo cromógeno, por reacción del cromo hexavalente con yoduro de potasio en un medio ácido para liberar yodo. Esto oxida al azul de variamina para formar una especie de color violeta con una absorción máxima a 556 nm. El análisis por energía dispersiva de rayos X (EDX) y la espectroscopía de infrarrojos (IR) confirmaron la extracción completa de cromo hexavalente mediante el proceso de extracción secuencial. Se utilizó SRM 2701 (material de referencia de NIST, EE.UU.) para validar los resultados. El porcentaje de recuperación para el método propuesto frente al de referencia (método de la difenilcarbazida) varió de 98.5 a 101 y 97.5 a 100.5, mientras que su porcentaje de error relativo varió de -1.5 a 0.33 y -2.5 a 0.5.

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Section: Edx Spectamentioning

confidence: 93%

A new method in estimation of total hexavalent chromium in Portland pozzolan cement

Sharma

2017

Mater. construcc.

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“…There have been a number of methods developed [19][20][21] for the production of LiFePO 4 which can be used as a cathode material in lithium-ion batteries. Iron(II) sulfate is also used in water purification [22][23][24] or chromium(VI) reduction in cement [25,26]. However, the salt must be stripped of most impurities.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Reactor-Based Preparation of Red Iron Oxide Pigment from Waste Iron Sulfate

2023

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This article presents a two-step method of iron red synthesis based on waste long-term deposited iron(II) sulfate. The first step is the purification of waste iron sulfate, and then the pigment is synthesized by precipitation using a microwave reactor. The newly developed method of purification allows for quick and thorough purification of iron salt. The use of a microwave reactor in the synthesis of iron red makes it possible to reduce the temperature of the goethite–hematite phase transition from 500 °C to 170 °C and skip the calcination process. A temperature reduction in the synthesis decreases the formation of agglomerates of synthesized materials compared to commercial ones. The results of the research showed a change in the physicochemical properties of the obtained pigments depending on the conditions of synthesis. Waste iron(II) sulfate is a promising raw material for the synthesis of iron red pigments. Laboratory pigments are found to be differ from commercial pigments. The difference in properties speaks in favor of synthesized materials.

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Influence of rice husk ash and rice tiller ash along with chromate reducing agents on strength and hydration properties of Ordinary Portland Cement

Sharma

2018

Construction and Building Materials

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Effect of FeSO4.7H2O and SnCl2.2H2O added as Chromium (VI) Reducers in Ordinary Portland Cement

Cited by 5 publications

References 4 publications

A new method in estimation of total hexavalent chromium in Portland pozzolan cement

A new method in estimation of total hexavalent chromium in Portland pozzolan cement

Microwave-Reactor-Based Preparation of Red Iron Oxide Pigment from Waste Iron Sulfate

Influence of rice husk ash and rice tiller ash along with chromate reducing agents on strength and hydration properties of Ordinary Portland Cement

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