Compound

Linear

regressiona

Linearity

(mg∙L−1)

Correlation

(R2)

LODb

(mg∙L−1)

RSD%

(time)

RSD%

(area)

K+

y = 10.387x + 1.146

0.05 - 20

0.9973

0.02

1.3

2.7

Ca2+

y = 3.747x + 0.151

0.25 - 20

0.9968

0.1

2.1

3.6

Na+

y = 4.837x + 0.766

0.1 - 15

0.9984

0.05

1.7

4.8

Sr2+

y = 1.671x + 0.058

0.4 - 15

0.9955

0.2

2.3

5.1

Mg2+

y = 5.076x + 0.612

0.1 - 20

0.9972

0.05

1.4

4.2