VOC-Pak

VOCs are industrial contaminants that may cause health safety issues and therefore should be detected in the environment. VOCs are routinely analyzed in water, soil, gas and air. Specifications for VOCs in drinking water have been established by different regulatory agencies in many countries.

Table 1 shows the Maximum Allowable Concentration (MAC) for some of the different VOCs monitored in the United States, Europe, Japan and China, as well as by the World Health Organization (WHO).

Table 1
	Maximum Allowable Concentration in potable tap water (ppb or µg/L)
VOC tested	US	EU	Japan	China	WHO
benzene	5	1	10	10	10
bromodichloromethane		100 (*)	30	60	60
bromoform			100 (**)	100	100
carbon tetrachloride	5	0,1	20	2	4
chlorobenzene	100			300
chloroform			60	60	200
dibromochloromethane		100 (*)	100	100	100
1,2-dichlorobenzene	600			1000	1000
1,4-dichlorobenzene	75			300	300
1,2-dichloroethane	5	3		30	30
1,1-dichloroethene	7		20	30	30
cis-1,2-dichloroethene	70		20	50
trans-1,2-dichloroethene	100		40	50
1,2-dichloropropane	5				40
cis-1,3-dichloropropene					20
trans-1,3-dichloropropene					20
ethylbenzene	700			300	300
tetrachloroethylene	5	10	10		40
toluene					700
1,1,1-trichloroethane	200
1,1,2-trichloroethane	5
trichloroethylene	5	10	30	70
o-xylene	10000		400 (***)	500 (***)
m-xylene	10000		400 (***)	500 (***)
p-xylene	10000		400 (***)	500 (***)
() EU - Sum of trihalomethanes < 100 µg/L () Japan - Sum of trihalomethanes (chloroform, Dibromochloromethane, Bromodichloromethane, bromoform) < 100 µg/L (**) Sum of xylenes < limit in µg/L Sources US: EPA - National Primary Drinking Water Standards EU: COUNCIL DIRECTIVE 98/83/ECof 3 November 1998 on the quality of water intended for human consumption Japan: Revision of drinking Water Quality Standards in Japan China: Drinking Water Standards and Monitoring, IRC International Water and Sanitation Centre WHO: Guidelines for Drinking-water Quality -THIRD EDITION -Volume 1 Recommendations (2004) Note: the data reported in table 1 is for information only and does not include all molecules reported in all norms – It is the responsibility of the user to verify the actual recommendations from the appropriate instances. The VOC-Pak cartridge is designed to assure scientists performing VOC analysis that the ultrapure water they use to rinse glassware, produce standard solutions or dilute samples is VOC-free.

VOC-Pak™ Point-of-Use Polisher

Feed & Product Water Quality

The VOC Pak is designed to produce water with VOC concentration below the analytical detection limit (*) for the VOC listed in Table 2, provided that their feed water concentration does not exceed 1 ppb (1 µg/L) and the TOC of the ultrapure water entering the VOC Pak is below 5 ppb.

In order to warrant this water quality, the VOC Pak was qualified by a challenge test: the POD-Pak was fed by ultrapure water containing the VOC to eliminate at a concentration of 1 ppb (1 µg/L) and the concentration of the VOC was measured by GC downstream of the VOC Pak after passage of 50, 100, 150 200,250, 300 and 350 L in order to determine the breakthrough of the different VOC’s. The results are displayed in Table 2.

Table 2
VOC tested	Challenge (ppb) (*)	Quantification limit (ppb) (**)	Concentration after POD pak (ppb) (***)
benzene	0.97	<0.05	<0.05
bromodichloromethane	1.56	<0.05	<0.05
bromoform	1.58	<0.50	<0.50
carbon tetrachloride	1.06	<0.05	<0.05
chlorobenzene	0.94	<0.05	<0.05
chloroform	1.07	<0.05	<0.05
dibromochloromethane	1.01	<0.10	<0.10
1.2-dichlorobenzene	1.01	<0.05	<0.05
1.4-dichlorobenzene	1.53	<0.05	<0.05
1.2-dichloroethane	1.08	<0.05	<0.05
1.1-dichloroethene	0.87	<0.05	<0.05
cis-1.2-dichloroethene	0.95	<0.05	<0.05
trans-1.2-dichloroethene	1.53	<0.05	<0.05
1.2-dichloropropane	0.86	<0.05	<0.05
cis-1.3-dichloropropene	0.97	<0.04	<0.04
trans-1.3-dichloropropene	0.91	<0.05	<0.05
ethylbenzene	1.09	<0.05	<0.05
tetrachloroethene	1.44	<0.05	<0.05
toluene	0.96	<0.10	<0.10
1.1.1-trichloroethane	0.94	<0.10	<0.10
1.1.2-trichloroethane	0.93	<0.05	<0.05
trichloroethene	1.02	<0.05	<0.05
o-xylene	0.79	<0.05	<0.05
m-xylene	1.02	<0.05	<0.05
p-xylene	0.94	<0.05	<0.05
() Challenge = VOC concentration in feed water upstream of VOC Pak () Quantification limit: limit of quantification of the VOC measured by GC downstream of the VOC Pak (**) Concentration of VOC below the VOC-Pak for a feed water concentration of 1 ppb Analysis of the VOC’s in ultrapure water were performed according to Millipore procedure 84214SO, using a Purge & Trap GC-MS system (GC model 6890N and MS model 5975B, both from Agilent Technologies). A copy of the complete qualification report with description of the analytical procedure is available upon request.

Analysis of the VOC’s in ultrapure water were performed according to Millipore procedure 84214SO, using a Purge & Trap GC-MS system (GC model 6890N and MS model 5975B, both from Agilent Technologies).

A copy of the complete qualification report with description of the analytical procedure is available upon request.

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