Table 2.

Number concentration of the gold suspensions. The tag “(ref)” denotes reference methods.

Method	${\mathit{C}}_{\mathit{Au}10}$/mL${}^{-1}$	${\mathit{C}}_{\mathit{Au}30}$/mL${}^{-1}$	${\mathit{C}}_{\mathit{Au}100}$/mL${}^{-1}$
SAXS (ref)	$(7.08\pm 1.13)·{10}^{12}$	$(1.85\pm 0.13)·{10}^{11}$	-
spICPMS (ref)	-	$(1.80\pm 0.14)·{10}^{11}$	$(4.10\pm 0.26)·{10}^9$
PTA	-	$(1.78\pm 0.08)·{10}^{11}$	$(4.31\pm 0.24)·{10}^9$
DLS	$(5.17\pm 2.96)·{10}^{12}$	$(1.88\pm 0.61)·{10}^{11}$	$(8.47\pm 2.18)·{10}^9$
UV-vis	$(7.64\pm 1.53)·{10}^{12}$	$(1.88\pm 0.38)·{10}^{11}$	$(4.27\pm 0.85)·{10}^9$
DCS/DLS	$(8.42\pm 2.53)·{10}^{12}$	$(1.61\pm 0.48)·{10}^{11}$	$(2.08\pm 0.62)·{10}^9$
ES-DMA-CPC	$(9.03\pm 0.32)·{10}^{11}$	$(3.22\pm 0.12)·{10}^{10}$	–
Nominal	$(4.84\pm 1.45)·{10}^{12}$	$(1.76\pm 0.53)·{10}^{11}$	$(4.16\pm 1.25)·{10}^9$