. 2021 Feb 9;28(23):29551–29563. doi: 10.1007/s11356-021-12604-7

Table 2.

Pearson inter-correlation coefficients of OP_V (nmol min⁻¹ m⁻³) responses with concentration of PM_2.5 mass and chemical components for all PM_2.5 samples. OP_V were measured after extraction with phosphate buffer, Gamble’s solution, and methanol. Concentrations of chemical components are expressed in ng m⁻³, unless differently specified. Significant r values based on a two-tailed t test (n = 32) are reported in bold (at p level < 0.01) and in italic (at p level < 0.05)

	OP_V^DTT PB	OP_V^DTT G	OP_V^DTT MeOH	OP_V^AA PB	OP_V^AA G	OP_V^AA MeOH
OP_V^DTT PB (nmol min^-1 m^-3)	1.00
OP_V^DTT G (nmol min^-1 m^-3)	0.683	1.00
OP_V^DTT MeOH (nmol min^-1 m^-3)	0.945	0.807	1.00
OP_V^AA PB (nmol min^-1 m^-3)	0.175	0.382	0.226	1.00
OP_V^AA G (nmol min^-1 m^-3)	0.162	0.387	0.255	0.605	1.00
OP_V^AA MeOH (nmol min^-1 m^-3)	0.113	0.148	0.155	0.456	0.431	1.00
PM_2.5 (μg m^-3)	0.541	0.770	0.651	0.253	0.305	0.075
OC (μg m^-3)	0.423	0.674	0.554	0.227	0.390	-0.045
EC (μg m^-3)	0.507	0.781	0.631	0.486	0.532	0.161
Levoglucosan	0.359	0.376	0.427	0.161	0.430	-0.118
NH₄⁺ (μg m^-3)	0.307	0.361	0.371	-0.136	0.059	-0.051
K⁺	0.319	0.419	0.421	-0.012	0.387	0.011
Cl^-	0.471	0.402	0.472	0.454	0.324	-0.137
NO₃^- (μg m^-3)	0.240	0.360	0.305	0.002	0.045	-0.065
SO₄^2- (μg m^-3)	0.452	0.379	0.496	-0.186	0.076	0.114
Total Metals	0.239	0.643	0.399	0.114	0.156	0.245
Fe	0.335	0.539	0.423	0.280	0.222	0.296
Mn	0.363	0.609	0.473	0.293	0.290	0.442
Zn	0.083	0.442	0.232	0.428	0.420	0.264
Pb	0.268	0.871	0.755	0.498	0.480	0.292
V	0.432	0.473	0.675	-0.033	0.025	0.050