Concentration of Inorganic Elements Content in Benthic Seaweeds of Fernando de Noronha Archipelago by Synchrotron Radiation Total Reflection X-Ray Fluorescence Analysis (SRTXRF)

Table 6

Representative chemical composition of alkaline rocks from Caieiras (1 to 5) and Sueste (6 to 8).

Caieiras					Sueste
	1	2	3	4	5	6	7	8	Average
K2O^a	1.45	4.85	4.86	2.92	1.83	2.21	5.16	3.67	3.37
CaO^a	11.2	5.80	4.10	6.81	12.5	10.5	0.58	5.73	7.15
TiO2^a	3.19	2.36	1.18	2.40	3.86	3.37	0.17	2.26	2.35
MnO^a	0.18	0.18	0.15	0.21	0.16	0.21	0.19	0.12	0.18
Fe2O3^atotal	12.9	5.99	4.57	7.71	12.5	13.2	2.23	4.79	7.99
V^b	275.1	164.0	71.0	171.8	239.9	257.0	13.0	187.4	172.40
Cr^b	505.1	229.0	—	37.3	303.5	303.0	—	—	275.58
Co^b	55.0	19.1	8.00	15.8	48.2	44.6	—	8.77	28.50
Ni^b	358.9	23.6	17.9	62.4	295.5	309.6	—	19.6	155.36
Cu^b	53.3	7.90	4.20	—	51.3	53.1	—	—	33.96
Zn^b	57.5	97.0	95.3	94.3	122.5	114.1	181.0	80.0	105.21
Rb^b	53.0	142.0	142.5	80.5	47.1	49.1	322.0	96.5	116.59
Sr^b	960.9	820.8	1329	1620	1744	1023	—	1520	1288.24
Mo^b	2.14	—	7.00	6.07	2.57	2.00	—	3.82	3.93
Cs^b	1.20	1.90	2.40	3.67	0.55	1.00	—	4.33	2.15
Ba^b	510.2	946.0	1191	1070	906.4	558.0	19.0	1330	816.33
Dy^b	5.96	7.10	6.60	5.94	8.11	6.90	—	6.90	6.79
Pb^b	—	13.3	14.7	14.5	5.21	7.20	32.0	11.9	14.12

—: not detected; ^awt %; ^bppm, —not analyzed. Using the procedure described in Janasi et al.[21], major, minor, and trace elements were determined by inductively coupled plasma-mass spectrometer (ICP-MS).