NO3-
Location	2017	2018
1a	13.2	8.8
1b	17.6	13.2
1c	13.2	17.6
1d	17.6	13.2
2a	8.8	17.6
2b	8.8	26.4
2c	22	17.6
2d	13.3	13.2
3a	17.6	26.4
3b	17.6	17.6
3c	17.6	26.4
3d	13.2	13.2
4a	8.8	26.4
4b	13.2	26.4
4c	13.2	26.4
4d	17.6	13.2