Brief operation conditions and optics of the ICP-AES
used in the present study are as follows: axial mode plasma:
15 L min1, auxiliary: 0.2 L min1, nebulizer: 0.65 L min1, RF
powder: 1300 W, flow rate: 1.5 mL min1. All elements, except K
and Na (axial mode of ICP-AES), were measured in the radial mode
of the ICP-AES