A weight-of-evidence approach to assess chemicals: case study on the assessment of persistence of 4,6-substituted phenolic benzotriazoles in the environment

Environmental Sciences Europe

Table 9 Comparison of measured concentrations of UV-328 in the Pawtuxet River and the Narragansett Bay during and after its production

Study	Detection limit (ppm)	Site	Year of collection	Sedimentation rate (cm)	Layer assumed to reflect production period (cm)	c at that layer (ppm)	c (historical, but probably not at the exact same spot) (ppm)
UV-327 (production period 1963–1972)
[48]	0.02	Pawtuxet River	1989	2–3	34–69	0.1 (at 52 cm)	20–300 [49]
[51]	0.01	Quonset Point (Narragansett Bay)	1997	2	54–68	0.5 (at 50–60 cm)	0.5 [34]
[51]	0.01	Apponaug Cove (Narragansett Bay)	1997	0.5–0.85	14–29	0.07 (at 10–12 cm)	0.5 [34]
UV-328 (production period 1970–1985)
[51]	0.01	Quonset Point	1997	2	24–54	0.04 (at 50–60 cm)	0.6 [34]
[51]	0.01	Apponaug Cove	1997	0.5–0.85	6–23	0.13 (at 10–12 cm)	0.6 [34]