Ammonia Nitrogen program for calculation in known addition.
N001 LBL N
N002 SF 10
N003 CALCULATION OF
N004 PSE
N005 AMMONIA
N006 PSE
N007 NITROGEN
N008 PSE
N009 ENTER THE SLOPE (MV)
N010 PSE
N011 CF 10
N012 INPUT S
N013 SF 10
N014 ENTER P
N015 PSE
N016 CF 10
N017 INPUT P
N018 SF 10
N019 ENTER R
N020 PSE
N021 CF 10
N022 INPUT R
N023 SF 10
N019 ENTER DELTA E (MV)
N020 PSE
N021 CF 10
N022 INPUT E
N023 (P*R)/(((1+P)*(10^(E/S)))-1)
N024 STO Q
N025 VIEW Q
N026 RTN
CALCULATIONS:
The slope S of the ammonia electrode is found by subtracting E1 from E2 and taking its absolute
value. eq 1 S = | E1 - E2 |
delta E is found by subtracting E3 from E4.
eq 2 delta E = E3 - E4
Using the slope of the electrode S, delta E and equation 3 the concentration ratio Q is found.
eq 3 Q = (p*R) / {((1+p)x10^(delta E /S)) - 1}
Where: Q = Concentration ratio
S = |slope of the electrode| or |E1 - E2|
p = Volume of standard / Volume of sample and ISA
r = Volume of sample and ISA / Volume of Sample
Multiplying Q by the concentration of the added standard, the concentration of the original sample is
found using equation 4.
eq 4 C' = Q x Cs
Where: C' = Total sample concentration, mg/l as NH3 - N
Q = is from equation 3
Cs = Concentration of the added standard, 1000 mg/l as Nitrogen