Date

Calibration equations:

Y = Gradient*x − Intercept

R²

RSD

% (n = 3)

24th Jun. 2015

Y = 13.92X + 30.94

0.998

3.0

6th Jul. 2015

Y = 11.58X + 22.68

0.990

0.3

7th Jul. 2015

Y = 13.63X + 23.27

0.997

2.8

12th Jul. 2015

Y = 12.85X

0.998

2.7

25th Jul. 2015

Y = 12.54X + 22.44

0.998

1.8

2nd Aug. 2015

Y = 12.03X + 22.90

0.982

1.6

7th Aug. 2015

Y = 12.22X ? 13.51

0.998

2.1

22nd Aug. 2015

Y = 11.2X +25

0.999

3.4

17th Aug. 2015

Y = 12.01X +3.568

0.999

2.8