Table 1.

Concentrations of Dissolved Hydrogen in Hydrogen Water, Determined by Electrochemical and Oxidimetry Methods

HW	DH (mg/l)	MB-Pt	MB→DH (mg/l)	DO (mg/l)	T (centigrade)
0.8 mM	1.60	55	1.65	0.54	24.8
	1.60	55	1.65	0.54	24.8
	1.62	56	1.68	0.45	23.7
	1.58	54	1.62	0.43	23.8
0.3 mM	0.62	19	0.57	1.6	25.3
	0.62	20	0.6	1.6	25.3
	0.60	18	0.54	2.1	23.5
	0.62	19	0.57	2.3	23.8
0.2 mM	0.41	12	0.36	2.1	25.1
	0.42	13	0.39	2.3	25.1
	0.41	13	0.39	2.4	23.6
	0.39	12	0.36	2.4	23.7
0.1 mM	0.22	5	0.15	3.0	24.8
	0.22	5	0.15	3.4	24.8
	0.20	4	0.12	4.3	23.8
	0.19	4	0.12	4.4	23.7

HW: hydrogen water, DH: dissolved hydrogen, MB-Pt: number of drops of methylene blue with colloidal platinum at the titration endpoint, MB→DH: calculated value of DH from MB-Pt, DO: dissolved oxygen, T: water temperature. DO was measured by a DO meter (model D-25 DO meter, Horiba).