Table 8: Integration of other organic peaks present in the spectra after the HF treatment.
IDP area[3600-2400] N[3600-2400] area[ $\sim$ 1700] N[ $\sim$ 1700] area[ $\sim$ 1600] N[ $\sim$ 1600] area[ $\sim$ 1585] N[ $\sim$ 1585]

OH cm^-2 C=O cm^-2 C cm^-2 COO^- cm^-2

carb. ac./hyd. sil.^a carb. ac./hyd. sil.^a carb. ac./ket.^b carb. ac./ket.^b arom.^c arom.^c carb. ac. salt^d carb. ac. salt^d

L2036-E19 - - - - - - - -

L2021-K3 0.67 $5.5 \times 10^{15}$ 0.16 $1.2 \times 10^{16}$ 0.097 $1.9 \times 10^{17}$ - -

L2021-K2 2.21 $1.8 \times 10^{16}$ - - - - 0.98 $3.8 \times 10^{16}$

L2011-F2 0.79 $6.5 \times 10^{15}$ 0.08 $5.8 \times 10^{15}$ - - 0.08 $3.1 \times 10^{15}$

W7116B-N 1.37 $1.1 \times 10^{16}$ 0.24 $1.8 \times 10^{16}$ 0.26 $5.0 \times 10^{17}$ - -

W7116B-Y 1.11 $9.1 \times 10^{15}$ 0.12 $8.9 \times 10^{15}$ - - 0.19 $7.3 \times 10^{15}$

W7116B-U 0.41 $3.3 \times 10^{15}$ 0.14 $1.0 \times 10^{16}$ 0.18 $3.5 \times 10^{17}$ - -

^a This band will have a contribution of the OH stretch in hydrated silicates, and a contribution of the OH str. in carboxylic acids. For calculation of N[3600-2400], we used $A=2.8\times 10^{-16}$ cm (OH bond)^-1 for carboxylic acids, see Table 3.
^b The band is probably due to the C=O stretch of ketones with a contribution of carboxylic acids. For calculation of N[ $\sim$ 1700], we used $A=3.2\times 10^{-17}$ cm (CO bond)^-1 for carboxylic acids. The column density using the band strength of ketones is 2.7 times larger, see Table 3.
^c Using $A=1.2\times 10^{-18}$ cm (C atom)^-1, for naphtalene in Ar matrix, see Table 3.
^d Using $A=6.0\times 10^{-17}$ cm (COO^-)^-1, see Table 3. The values given for L2021-K2 correspond to the spectrum before HF treatment, as the salt is expected to be affected by hydrolysis. Indeed, for this particle, area[ $\sim$ 1585] decreased by $\sim$ 25% upon hydrolysis.

**Table 8:** Integration of other organic peaks present in the spectra after the HF treatment.
IDP	area[3600-2400]	N[3600-2400]	area[ $\sim$ 1700]	N[ $\sim$ 1700]	area[ $\sim$ 1600]	N[ $\sim$ 1600]	area[ $\sim$ 1585]	N[ $\sim$ 1585]
		OH cm^-2		C=O cm^-2		C cm^-2		COO^- cm^-2
	carb. ac./hyd. sil.^a	carb. ac./hyd. sil.^a	carb. ac./ket.^b	carb. ac./ket.^b	arom.^c	arom.^c	carb. ac. salt^d	carb. ac. salt^d
L2036-E19	-	-	-	-	-	-	-	-
L2021-K3	0.67	$5.5 \times 10^{15}$	0.16	$1.2 \times 10^{16}$	0.097	$1.9 \times 10^{17}$	-	-
L2021-K2	2.21	$1.8 \times 10^{16}$	-	-	-	-	0.98	$3.8 \times 10^{16}$
L2011-F2	0.79	$6.5 \times 10^{15}$	0.08	$5.8 \times 10^{15}$	-	-	0.08	$3.1 \times 10^{15}$
W7116B-N	1.37	$1.1 \times 10^{16}$	0.24	$1.8 \times 10^{16}$	0.26	$5.0 \times 10^{17}$	-	-
W7116B-Y	1.11	$9.1 \times 10^{15}$	0.12	$8.9 \times 10^{15}$	-	-	0.19	$7.3 \times 10^{15}$
W7116B-U	0.41	$3.3 \times 10^{15}$	0.14	$1.0 \times 10^{16}$	0.18	$3.5 \times 10^{17}$	-	-

Source LaTeX | All tables | In the text

	1 Introduction
	2 Materials and methods
	3 Results
	4 Discussion
	5 Conclusions and perspectives
	References