Characterization of Polyhexamethylene Guanidine Oligomers in Solutions and Aerosols Emitted during Humidifier Use

Table 1

Estimated airborne PHMG concentration by distance (μg/m³) when using the Oxy product solution containing 6.5 ppm and 65 ppm of PHMG.

			Concentration in the humidifier solution and measurement distance from the humidifier (mean (SD))
			6.5 ppm PHMG solution		65 ppm PHMG solution
			0.5 m	1 m	0.5 m	1 m
Linear structures	Type A	A1	2.67 (0.51)	—	10.69 (4.41)	0.31 (0.39)
		A2	6.18 (3.30)	—	76.73 (40.44)	—
		A3	1.72 (1.54)	—	39.90 (20.66)	—
		A4	0.04 (0.07)	—	10.91 (6.25)	—
		A5	—	—	3.78 (2.76)	—
	Type B	B1	2.09 (1.89	—	53.35 (29.75)	—
		B2	0.79 (0.80)	—	33.38 (18.46)	—
		B3	—	—	14.36 (9.31)	—
		B4	—	—	3.78 (2.96)	—
	Type C	C1	12.64 (1.58)	—	40.14 (14.73)	3.98 (1.46)
		C2	3.83 (1.34)	—	39.99 (21.16)	—
		C3	0.44 (0.35)	—	10.90 (6.19)	—
		C4	0.003 (0.003)	—	3.50 (2.45)	—
Branched or cyclic structures	Type D	D1	0.01 (0.01)	—	1.73 (1.22)	—
		D2	—	—	0.55 (0.44)	—
	Type E	E2	5.47 (1.50)	—	47.28 (24.42)	0.19 (0.33)
		E3	—	—	—	—
	Total		35.89 (12.83)	—	390.96(205.50)	4.48 (2.18)