High-Precision In Situ ⁸⁷Sr/⁸⁶Sr Analyses through Microsampling on Solid Samples: Applications to Earth and Life Sciences

Table 1

Blank contamination level.

	Laboratory blanks			Isotope ratios on blanks
Standard procedure on large size samples	Sr pg	1 SD	n	^87Sr/^86Sr	1 SD	n
	127	60	32	0.707497	0.000060	5
Procedure on small size samples	38	19	16
Total procedure (drilling, digestion, and elemental selection)
Chemical digestion and separation	17	6	12

1 SD, standard deviation (external precision); n, numbers of blank measurements; the average Sr-isotope value obtained from 5 unspiked blanks is reported to fully characterize the potential contamination component.