Skip to main content
Earth, Planets and Space

Table 3 Concentrations of major ions (Cl−, NO2−, Br−, NO3−, SO42−, PO43−, F−, acetic acid, formic acid, NH4+, 2A2M (2-amino-2-methyl-1-propanol), and DMA (dimethylamine), from static sampling, air-filter sampling, and swab sampling during sampler-system development up to the launch of the Hayabusa2 spacecraft

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

Sample code

Profile

Concentration (ng/sample)

Remarks

Anion

Cation

Cl−

NO2−

Br−

NO3−

SO42−

PO43−

F−

Acetic acid

Formic acid

NH4+

2A2M

DMA

Static sampling

 CPS-01

CC1-Py_Schale

1100

9.0

< 3.6

754

156

< 6.5

19

16

10

32

< 9.9

< 4.2

 

 CPS-02

CC2-Py_Schale

181

5.6

< 3.7

136

80

< 6.4

4.0

107

181

< 2.1

< 9.3

< 3.9

 CPS-03

CC3-Py_Schale

269

4.5

< 3.7

287

47

< 6.4

3.8

57

4.2

< 2.1

< 9.3

< 3.9

 CPS-04

CC4-Py_Schale

509

8.5

< 3.7

401

88

< 6.4

11

135

7.6

< 2.1

< 9.3

< 3.9

 CPS-05

CC5-Py_Schale

108

7.1

< 3.7

26

8.8

< 6.4

2.2

27

6.4

< 2.1

< 9.3

< 3.9

 CPS-06

CC6-Py_Schale

110

5.6

< 3.6

29

13

< 6.5

1.5

< 3.7

< 1.9

< 2.1

< 9.9

< 4.2

 CPS-08

CC8-Py_Schale

36

4.0

< 3.7

3.7

6.5

< 6.4

< 0.8

68

4.1

< 2.1

< 9.3

< 3.9

 CPS-09

CC9-Py_Schale

17

< 2.2

< 3.7

< 2.5

5.5

< 6.4

1.9

296

3.7

< 2.1

< 9.3

< 3.9

 CPS-10

CC10-Py_Schale

35

3.1

< 3.7

7.6

20

< 6.4

1.1

107

2.5

< 2.1

< 9.3

< 3.9

 CPS-12

CC12-Py_Schale

17

3.1

< 3.7

9.2

4.4

< 6.4

1.5

64

5.7

< 2.1

< 9.3

< 3.9

 CPS-15

CC15-Py_Schale

< 1.4

3.6

< 3.6

< 2.5

2.2

< 6.5

< 0.8

4.3

5.8

< 2.1

< 9.9

< 4.2

Process blank for experimental background

Air filter sampling

 QFT-01

BLANK-#2

< 80

< 4

< 24

< 80

< 80

20

8

< 80

< 12

180

< 12

< 4

Quartz filter of process blank

 QFT-02

141024-QF-#2

213

< 15

< 27

< 18

630

< 78

129

< 30

< 12

< 15

< 66

< 33

Quartz filter at SFA2

 QFT-03

VAB-12F

188

< 4

< 24

< 80

132

20

48

< 80

< 12

156

< 12

< 4

Quartz filter at VAB-12F

 QFT-04

STA1-CR

156

< 4

< 24

< 80

192

12

160

< 80

< 12

80

< 12

32

Quartz filter at STA1-CR

Swab sampling

 GWT-01

141024-00B

< 12

< 15

< 27

< 18

< 15

< 78

15

< 30

< 12

< 15

< 66

< 33

Glass wool of process blank

 GWT-02

141024-01A-#2

2880

42

< 27

159

216

< 78

276

< 30

< 12

< 15

< 66

< 33

Glass wool at SFA2 payload room

 GWT-03

141024-02A-#2

1170

63

< 27

330

1980

< 78

1290

150

114

< 15

< 66

< 33

Glass wool at SFA2 fairing room elevator

 GWT-04

141024-03A-#2

630

18

< 27

150

540

< 78

12

< 30

< 12

< 15

< 66

< 33

Glass wool at SFA2 fairing room

 GWT-05

141024-04A-#2

23,800

120

< 27

5220

2160

< 78

51

48

36

< 15

< 66

< 33

Glass wool at VAB-12F floor

 GWT-06

141024-05A-#2

23,000

87

< 27

1860

3930

< 78

51

< 30

< 12

< 15

< 66

< 33

Glass wool at VAB-12F support rod

  1. Static concentrations were normalized in units of nanograms per sample (ng/sample) following Takano et al. (2020) using the system of ion chromatography (IC; DX-120 for cations; DX-500 for anions; Dionex Inc.) with Ion Pac CS10 and Ion Pac AS17 columns for cations and anions, respectively (Dionex Inc.). The concentrations of area-based conversions (i.e., ng cm−2) can be obtained by reference to the size scale (Fig. 1). 2A2M and DMA were analyzed in the same way and are shown as the maximum value for the sample
Back to article page