A low-cost device for sample introduction and determination of mercury by Cold Vapour Atomic Absorption Spectrometry – application for irrigation water and paddy soil

A low-cost device for sample introduction and determination of mercury by Cold Vapour Atomic Absorption Spectrometry – application for irrigation water and paddy soil

MERCURIO

ESPECTROMETRIA DE ABSORCION

VAPOR FRIO

BIBLIOGRAFIA NACIONAL QUIMICA

2017

Mercury (Hg) is a global pollutant that is released into the environment from geological and anthropogenic sources and its compounds are highly mobile and toxic at trace level. A simple method based on cold vapour atomic absorption spectrometry (CV AAS) for the determination of total mercury in irrigation waters and extractable mercury in paddy soil was validated, using a low-cost sample introduction -1 device. The validated method presented a linear range from 0.2 to 2.0 µg L ; detection limits were 0.03 -1 -1 µg L and 0.012 mg kg (dry basis) for irrigation water and paddy soil respectively. Trueness was evaluated using spiked samples; the mean recovery was 101% (n=8) and 99.4% (n=6) for irrigation water and paddy soil respectively. Precision, expressed as relative standard deviation (RSD), was 9.6% (n=10) and 24% (n=8) for irrigation water and paddy soil respectively. These figures of merit were adequate for the determination of total Hg levels in irrigation waters and extractable Hg in paddy soils established by the regulations. To assess analytical performance several samples from the Eastern zone of Uruguay were analysed. Sample preparation consisted of an acid digestion using an economical pressurized reactor. Hg levels in waters and paddy soils were all below the maximum allowed and therefore were apt for agricultural use. These results are very important not only locally but also for the world since Uruguay is currently among the eight-largest paddy rice and milled rice exporter in the world. This method can be an alternative instead of the more expensive techniques mostly not available in developing countries and very easy to implement in environmental laboratories. A low-cost device for sample introduction and determination of mercury by Cold Vapour Atomic Absorption Spectrometry – application for irrigation water and paddy soil (PDF Download Available). Available from: https://www.researchgate.net/publication/317039389_A_low-cost_device_for_sample_introduction_and_determination_of_mercury_by_Cold_Vapour_Atomic_Absorption_Spectrometry_-_application_for_irrigation_water_and_paddy_soil [accessed Oct 23 2017].

Brazilian Journal of Analytical Chemistry v. 4, no. 14, 2017. -- p. 34-43

BrJAC

2017

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