Characteristics and Migration Patterns of Selenium in Soil, Crops, and Hair in Northwest China

The study investigated the selenium content in crops, soil, and human hair in Aksu, Xinjiang, a typical alkaline arid area of northwest China. The selenium content in the soil ranged from 0.09 to 4.60 mg/kg, averaging at 0.356 mg/kg. Among various crops, the average selenium levels were highest in wheat (0.084 mg/kg) and lowest in jujubes (0.039 mg/kg). Human hair selenium content ranged from 0.34 to 0.57 mg/kg, with an average of 0.46 mg/kg. The selenium content in soil, crops, and human hair all fell within the safe range. The study aimed to provide a scientific foundation for the development and utilization of selenium-rich farmland and enhance the health status of regional residents by studying the transfer modes and influencing factors of selenium within the alkaline arid environment.