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