Table 1.

Summary of statistical results for both laboratory and field analyses. Slope, intercept, and r² coefficient were calculated from linear regression model of photo predicted versus ICP-MS determined As for concentrations up to 150 μg/L, and for full range with maximum As concentration display to the right. Laboratory and field detection limits (DL) based on predicted values from regression up to 150 μg/L, and full range. Field blanks were classified by ICP-MS determined concentrations below 1 μg/L. If there were less than 5 blanks, the detection limit was not provided.

			0–150 μg/L			Full range
Date	Labe1	Figure	n	r2	DL (μg/L)	n	r2	DL (μg/L)	Max As (ug/L)
April 16th, 2015	Lab 1	SI-1	5	1.00	–	9	0.96	–	1000
April 23rd, 2015	Lab 2	SI-2	13	0.96	–	17	0.99	–	1000
Oct, 7th, 2015	Lab 3	SI-3	14	0.97	–	24	0.95	–	1280
Jul 30th, 2016	Lab 4	SI-4	10	0.99	8.2	13	0.97	150	1000
2015–2016	Lab 1–4	SI-5	42	0.96	9.2	62	0.90	180	1280
July, 2015	Field	SI-6	220	0.83	22	274	0.75	61	750