Analysis of inorganic arsenic in Pyropia yezoensis and determination of total arsenic in aquaculture areas

Abstract:

Through analysis of the contents of inorganic arsenic of laver product and the total arsenic of local sea water and sediments in the main laver producing areas of China, a preliminary study was conducted on relations between total arsenic in cultivated sea area and the inorganic arsenic in its products. In 2012-2013, original samples and processed products of alga Pyropia yezoensis were collected from Jiangsu province based on different productive collecting time, and the inorganic arsenic content of each sample was determined. Total arsenic in surface sediments and seawater from the culture areas were also detected through quantitative measurements The results showed that contents of inorganic arsenic in original laver samples range:0.22-0.70 mg/kg, processed products range:0.12-0.32 mg/kg, inorganic arsenic content of original algae and processed products decreased during the production stage, and contents of inorganic arsenic in original alga and processed products measured up to the national quality standards; Contents of total arsenic in sea water samples range: 0.000 83-0.004 91 mg/L, and all of the total arsenic in sea water samples met the quality standard of cultivate water. This showed the positive correlation between the inorganic arsenic of laver products and the total arsenic of cultivated sea area; Contents of total arsenic in surface sediments range:15.435-58.900 mg/kg, and this has no obvious correlation with the content of inorganic arsenic in Porphyra yezoensis.