Abstract
We have developed and assessed LA-RIMS as the isotope analysis method for trace inorgac elements in agricultural products. We used magnesium isotope analysis to verify that LA-RIMS had the capability to identify the production areas with the required precision of 0.3%. We demonstrated direct measurements of trace strontium (sub ppm level) in brown rice and confirmed that the isotope analysis precision was improved through the signal intensity enhancement by increasing the ablation power and expanding the laser spot. For the present system, we estimated the strontium isotope ratio of 87Sr/86Sr to be 0.69±0.10 (14%). We concluded that the direct isotope analysis for trace inorganic elements such as strontium in brown rice using LA-RIMS had an advantage under the serious situation of isobaric interference and had sufficient capability to identify agricultural production areas.
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