WATERCHEM_rsi(): Ryznar Stability Index (RSI)

About:

Calculate the Ryznar Stability Index (RSI).
\begin{equation} RSI = 2 \times pH_s - pH \end{equation}

Module: WaterChemistry

Function: WATERCHEM_rsi(t,ph,tds,ca,hco3)

Parameters:

• t, temperature - ºC;
• ph, water pH
• tds, Total Dissolved Solids - mg/l;
• ca, concentration of calcium hardness, mg Ca/liter;
• hco3, concetration of HCO3- (alkalinity), mg CaCO3/liter.

Sample code:

from WaterChemistry  import *

ph = 7.7    # water pH
tds = 300   # mg TDS/liter
ca = 50     # mg Ca/liter
hco3 = 100  # mg CaCo3/liter (Alkalinity)
t = 20      # oC

rsi = WATERCHEM_rsi(t,ph,tds,ca,hco3)

print("RSI:",rsi)

Result:

RSI: 8.128539459578171