Table 1.

Concentration of samples prepared by addition of three selected compounds.

Sample	Glyphosate (mol·dm−3) × 10−4	Humic acids (mol·dm−3) × 10−4	Ca2+ (mol·dm−3) × 10−4
1	10	10	1
2	1	10	10
3	5	5	5
4	10	1	5
5	1	10	1
6	10	5	10
7	10	10	10
8	10	10	10
9	10	10	10
10	1	1	1
11	1	1	10
12	10	1	10
13	10	10	10
14	1	1	5
15	5	1	10
16	5	1	1
17	10	1	1
18	10	1	10
19	0	0	0