NANOHUNTER II: environmental analysis (effluent)


According to standards for hazardous pollutants in effluent, set by the Ministry of the Environment in Japan, arsenic (As) and selenium (Se) limits are set below 0.1 m g/L. T he spectrum of 10 ppb Se in water solution clearly shows a prominent Kα peak relative to the background (red spectrum). From this measurement, the calculated lower limit of detection (LLD) is about 0.8 ppb. The sample was easily prepared by pipetting 10 μL of aqueous solution onto a glass substrate followed by drying. Large numbers of samples may be quickly prepared and measured with this “Drop & Dry” sample preparation technique.