条斑紫菜中无机砷含量及海区环境痕量砷的分析

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

摘要:

通过分析我国条斑紫菜主产区紫菜产品中无机砷、栽培海区海水、沉积物中总砷含量在整个生产周期中的变化情况，初步探讨栽培海区环境中砷含量与条斑紫菜中砷含量的关系。于2012-2013年紫菜栽培季节，按实际生产的采收批次，分别采收条斑紫菜原藻、加工品，对样品中的无机砷含量进行测定与分析，并对栽培海区的海水及表层沉积物中总砷进行定量检测与分析。结果显示，江苏省条斑紫菜原藻样品中无机砷含量为0.22～0.70 mg/kg，加工品中无机砷含量为0.12～0.32 mg/kg，原藻及加工品中的无机砷含量随生产阶段的推后呈下降趋势，完全符合国家食品安全限量标准；栽培海区海水总砷含量为0.000 83～0.004 91 mg/L，在整个生产周期都低于国家养殖用水水质标准对砷的限量要求，栽培海区海水中的总砷与当地紫菜产品中的无机砷之间总体呈正相关关系；表层沉积物中总砷含量范围为15.435～58.900 μg/g，与条斑紫菜中无机砷含量没有明显的相关性。

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.