Environmental assessment in the prelaunch phase of Hayabusa2 for safety declaration of returned samples from the asteroid (162173) Ryugu: background monitoring and risk management during development of the sampler system

Sakamoto, Kanako; Takano, Yoshinori; Sawada, Hirotaka; Okazaki, Ryuji; Noguchi, Takaaki; Uesugi, Masayuki; Yano, Hajime; Yada, Toru; Abe, Masanao; Tachibana, Shogo

doi:10.1186/s40623-022-01628-z

Earth, Planets and Space

Table 6 Correlation matrix of the major components in the static samples using the CPS1–12 (n = 10) and CAS1–12 (n = 10) data sets

From: Environmental assessment in the prelaunch phase of Hayabusa2 for safety declaration of returned samples from the asteroid (162173) Ryugu: background monitoring and risk management during development of the sampler system

	Total organics	Fe	Cu	Ni	Zn	Na	K	Ca	Mn	Al	Ti	Mg	P	Cl⁻	NO₂⁻	NO₃⁻	SO₄²⁻	F⁻
Total Organics	1	0.418	0.531	0.624	0.828	0.839	0.835	0.597	0.789	− 0.406	0.812	0.765	0.840	0.871	0.749	0.798	0.751	0.841
Fe	0.418	1	0.346	0.560	0.532	0.605	0.574	0.321	0.556	0.483	0.490	0.435	0.743	0.605	0.227	0.606	0.507	0.593
Cu	0.531	0.346	1	0.444	0.475	0.566	0.554	0.387	0.458	− 0.058	0.518	0.469	0.476	0.571	0.283	0.542	0.549	0.548
Ni	0.624	0.560	0.444	1	0.876	0.908	0.882	0.772	0.779	− 0.353	0.810	0.839	0.802	0.873	0.598	0.927	0.894	0.846
Zn	0.828	0.532	0.475	0.876	1	0.947	0.953	0.842	0.946	− 0.345	0.907	0.973	0.916	0.948	0.801	0.962	0.946	0.947
Na	0.839	0.605	0.566	0.908	0.947	1	0.991	0.805	0.895	− 0.353	0.918	0.910	0.937	0.995	0.784	0.988	0.956	0.974
K	0.835	0.574	0.554	0.882	0.953	0.991	1	0.790	0.934	− 0.355	0.892	0.935	0.916	0.994	0.815	0.989	0.946	0.991
Ca	0.597	0.321	0.387	0.772	0.842	0.805	0.790	1	0.754	− 0.387	0.935	0.874	0.786	0.771	0.706	0.780	0.936	0.790
Mn	0.789	0.556	0.458	0.779	0.946	0.895	0.934	0.754	1	− 0.210	0.817	0.966	0.869	0.915	0.791	0.919	0.876	0.961
Al	− 0.406	0.483	− 0.058	− 0.353	− 0.345	− 0.353	− 0.355	− 0.387	− 0.210	1	− 0.358	− 0.364	− 0.124	− 0.340	− 0.509	− 0.334	− 0.367	− 0.293
Ti	0.812	0.490	0.518	0.810	0.907	0.918	0.892	0.935	0.817	− 0.358	1	0.886	0.927	0.902	0.743	0.875	0.967	0.892
Mg	0.765	0.435	0.469	0.839	0.973	0.910	0.935	0.874	0.966	− 0.364	0.886	1	0.852	0.912	0.798	0.930	0.944	0.946
P	0.840	0.743	0.476	0.802	0.916	0.937	0.916	0.786	0.869	− 0.124	0.927	0.852	1	0.939	0.709	0.910	0.906	0.924
Cl⁻	0.871	0.605	0.571	0.873	0.948	0.995	0.994	0.771	0.915	− 0.340	0.902	0.912	0.939	1	0.793	0.985	0.938	0.984
NO₂⁻	0.749	0.227	0.283	0.598	0.801	0.784	0.815	0.706	0.791	− 0.509	0.743	0.798	0.709	0.793	1	0.757	0.755	0.795
NO₃⁻	0.798	0.606	0.542	0.927	0.962	0.988	0.989	0.780	0.919	− 0.334	0.875	0.930	0.910	0.985	0.757	1	0.944	0.972
SO₄²⁻	0.751	0.507	0.549	0.894	0.946	0.956	0.946	0.936	0.876	− 0.367	0.967	0.944	0.906	0.938	0.755	0.944	1	0.938
F⁻	0.841	0.593	0.548	0.846	0.947	0.974	0.991	0.790	0.961	− 0.293	0.892	0.946	0.924	0.984	0.795	0.972	0.938	1

Principal component load statistics are included in the Additional file 1

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