"pH" means the logarithm of the reciprocal of the concentration of hydrogen ions in gram equivalents per liter of solution.
N.H. Code Admin. R. Env-Wq 1202.46
#8235, eff 12-22-04 (See Revision Note at chapter heading for Env-Wq 1200) (formerly Env-Ws 1202.46 ); ss by #9798-A, eff 10-9-10