of course I have a spectrometer at work....
so this is what I measured:
standard curve of KNO3 in MQ water at 200 nm:
0 ppm NO3 blanco
5 ppm NO3 0,113
10 ppm NO3 0,160
20 ppm NO3 0,312
30 ppm NO3 0,486
standard curve of KNO3 in MQ water at 220 nm:
0 ppm NO3 blanco
5 ppm NO3 0,049
10 ppm NO3 0,068
20 ppm NO3 0,129
30 ppm NO3 0,197
standard curve of KNO3 in MQ water at 240 nm:
30 ppm NO3: 0,004 (less NO3 gave 0,000)
standard curve of KNO3 in MQ water at 260 nm:
30 ppm: 0,000 (less NO3 gave also 0,000)
and here my tankwater:
200 nm: 2,847
220 nm: 2,648
240 nm: 1,64
260 nm: 0,080
absorbance measured on a beckman coulter du-530.
would it be possible to calculate NO3 levels in tapwater from these values???
greets,
yme