TABLE V

Composition of Extracts of the Polyethylene Film

pH		Concentration of Analytes (mg/L)
Prepared	Measured	Ca	Zn	Stearate	Palmitate	Net TOC (1)
Low pH, 0.05 M sodium phosphate buffer
2.5	2.6	0.17	0.11	<0.01	0.012	1.3
3.0	3.1	0.16	0.11	<0.01	0.012	0.9
3.5	3.6	0.14	0.10	<.001	0.012	0.9
4.0	4.1	0.20	0.15	<0.01	0.012	1.0
4.5	4.6	0.12	0.11	<0.01	0.012	1.0
Intermediate pH, 0.05 M potassium phosphate buffer
5.0	5.1	0.05	0.08	0.03	0.04	3.5
5.5	5.6	0.06	0.06	0.03	0.04	3.6
6.0	6.1	0.07	0.06	0.03	0.04	5.4
6.5	6.6	0.09	0.06	0.03	0.03	7.1
7.0	7.0	0.08	0.03	0.03	0.04	6.5
7.5	7.5	0.10	0.07	0.04	0.04	9.2
High pH, 0.025 M borax (sodium tertaborate decihydrate) buffer
8.0	8.1	0.07	0.02	<0.01	0.07	10.3
8.5	8.6	0.08	0.01	0.02	0.27	12.7
9.0	9.0	0.02	<0.01	0.05	0.69	16.6
9.5	9.5	0.02	<0.01	0.24	0.74	17.7
10.0	9.8	<0.01	<0.01	0.30	1.16	21.3
10.5	10.2	<0.01	<0.01	0.98	2.04	27.7
11.0	10.4	<0.01	<0.01	0.85	2.17	28.6

Note: (1) TOC = Total organic carbon. Extracted TOC = TOC in extract − TOC in extraction blank.