Molecular ions of zinc, manganese, nickel, and lead detected by MPT-MS in water samples collected from irrigation farmland^a.

S/N	Samples	Zinc ion				Manganese ion				Nickel ion				Lead ion
		Spiked (ng L−1)	Original (ng L−1)	Detected (ng L−1)	Recovery (%)	Spiked (ng L−1)	Original (ng L−1)	Detected (ng L−1)	Recovery (%)	Spiked (ng L−1)	Original (ng L−1)	Detected (ng L−1)	Recovery (%)	Spiked (ng L−1)	Original (ng L−1)	Detected (ng L−1)	Recovery (%)
1	Flood irrigation system	20	2.5	19.95	87.25	20	0.14	20.19	100.25	15	0.51	15.01	96.67	10	2.89	13.50	106.10
2		20	3.5	21.09	87.95	20	0.32	19.51	95.95	15	1.2	14.86	91.07	10	3.08	12.95	98.70
3		20	1.27	20.81	97.70	20	1.27	20.93	98.30	15	0.22	14.09	92.47	10	2.42	12.84	104.20
4		20	3.5	21.72	91.10	20	0.15	18.44	91.45	15	3.36	16.99	90.87	10	2.25	12.59	103.40
5		20	3.07	19.45	81.90	20	0.85	20.53	98.40	15	2.44	18.09	104.33	10	1.98	12.78	108.00
6		20	5.5	22.01	82.55	20	0.24	22.97	113.65	15	2.5	15.15	84.33	10	3.25	14.50	112.5
1	Lateral move irrigation system	20	2.01	22.15	100.70	20	0.77	20.86	100.45	15	2.08	15.95	92.47	10	3.50	14.25	107.50
2		20	3.25	22.95	98.50	20	—	18.5	92.5	15	0.91	14.19	88.53	10	3.01	12.38	93.70
3		20	2.08	23.02	104.70	20	9.69	29.28	97.95	15	1.05	13.9	85.67	10	1.14	13.09	119.50
4		20	1.35	22.00	103.25	20	—	17.58	87.9	15	1.78	14.84	87.07	10	2.85	11.97	91.20
5		20	1.35	19.09	88.70	20	0.52	20.86	101.7	15	—	14.56	97.10	10	4.69	14.50	98.10
6		20	1.41	19.90	92.45	20	1.63	21.33	98.5	15	2.04	17.98	106.27	10	1.27	11.01	97.40
1	Sub-irrigation systems	20	3.20	24.56	106.80	20	0.36	21.48	105.60	15	1.01	14.05	86.933	10	3.50	12.22	87.20
2		20	2.69	23.96	106.35	20	1.06	23.55	112.45	15	0.36	15.9	103.60	10	2.41	12.69	102.80
3		20	2.36	22.55	100.95	20	1.25	20.86	98.05	15	0.29	14.69	96.00	10	3.62	12.48	88.60
4		20	3.05	22.02	94.85	20	1.36	23.99	113.15	15	—	17.01	113.40	10	3.49	13.11	96.20
5		20	1.39	21.94	102.75	20	1.15	22.05	104.5	15	1.96	19.02	113.73	10	2.49	12.18	96.90
6		20	2.35	21.36	95.05	20	—	23.32	116.6	15	—	13.86	92.40	10	4.75	15.50	107.50

^a—: not detected.