Biological Samples:

A huge range of the samples of biological origin are subjected to analytical process for the determination of the elements present in them. These may involved plant leaves, fruits, blood, vegetables, muscle tissue, urine, hair, etc. The main difficulty in the analysis of these materials is their complex nature. More so, these samples cannot be analysed directly but needs dry ashing followed through wet digestion along with oxidizing acids such as HNO₃ and HClO₄. In the case of blood analysis, plasma or serum is commonly preferred because of the presence of significant amounts of clinically significant elements in them.