VSC measurement was achieved with a Halimeter or portable monitor Halimeter, Brochure 2004, range 0-400mV=0-1999 ppb.Interscan Corp, Chatworth CA.
La medición de CVS se realizó a través del Halimetro o monitor portátil Halimeter, Brochure 2004, rango 0 -400 mV = 0 -1999 ppb.