Determination of Heavy Metals in Alpinia oxyphylla Miq. Collected from Different Cultivation Regions

Table 3

The calibration curves and correlation coefficients of each element.

Element	The standard curve	Correlation coefficient	Linearity range
As			0~50 μg·L^−1
Hg			0~2 μg·L^−1
Pb			0~8 μg·L^−1
Cd			0~8 μg·L^−1
Cu			0~2 mg·L^−1