Method for rapidly detecting arsanilic acid and roxarsone in water sample

Abstract

The invention discloses a method for rapidly detecting arsanilic acid and roxarsone in water sample. The method comprises the following specific steps of: firstly taking three aliquots of identical water samples, respectively adjusting the pH values of the two aliquots of water samples to be strongly acidic or strongly alkali, then pouring the two aliquots of water samples with adjusted pH values into a quartz reactor, leading into inert gas for removing oxygen, switching on an ultraviolet disinfection lamp for irradiation so as to convert organic selenium into inorganic selenium; and after the reaction is finished, detecting inorganic selenium contained in the three aliquots of water samples by adopting an atomic fluorescence spectroscopy, and respectively obtain background value of inorganic selenium, content of arsanilic acid and content of roxarsone in the water samples. The method is simple to operate, good in repeatability, and high in selectivity, the detection limit of the organic selenium can be greatly reduced, the detection precision can be improved, and the detection capability of a laboratory can be effectively promoted; in addition, chemical reagents are common reagents, so that the cost is low, the use amount is small, and the induced secondary pollution is small.

Description

technical field

[0001] The invention belongs to the technical field of pollutant detection, and in particular relates to a method for rapidly detecting low-concentration arsanic acid and roxarsone in water samples. Background technique

[0002] Since the 1990s in my country, organic arsenic preparations have been widely used in the livestock and poultry breeding industry, mainly for inhibiting pathogenic microorganisms, improving feed utilization to promote the growth of livestock and poultry, and improving the appearance and color of livestock products. The most commonly used organic arsenic feed additives are p-arsanilic acid and roxarsone. However, the utilization rate of these organic arsenic preparations in animals is extremely low, most of the organic arsenic preparations in the feed will directly enter the surface environment around the farm along with animal excrement, and the organic arsenic preparations remaining on the soil surface can pass through Rainwater runo...

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