Vista pro icp aes

The samples subjected to the analysis of the aluminum content were mineralized with HNO₃ s.p. for 50 min at 180 °C, in Easy Prep Plus high-pressure containers (1500 psi, with 1600 W power) using a MARS-5 microwave digestion system (CEM, Matthews, NC, USA).
A Varian (Springvale, Australia) Vista PRO ICP-AES with a sample introduction system consisting of a glass concentric K-style pneumatic nebulizer jointed to a glass cyclonic spray chamber was employed for aluminum determination. All samples were analyzed at the wavelengths of aluminum (308.215 nm, 394.401 nm, and 396.152 nm), using on-line internal standardization (4 mg/L Lu standard solution).
The instrumental detection limit was 0.002 mg/L. The procedural detection limit, evaluated as three times the standard deviation of seven blank samples, was 0.020 mg/L.
Operating conditions of the ICP-AES analysis: ICP RF Power, 1100 W; Plasma gas flow rate, 15.0 L/min; Auxiliary gas flow rate, 1.5 L/min; Nebulizer gas flow rate, 0.75 L/min; Sample uptake rate, 0.78 mL/min; Internal standard (Lu 4 ppm) uptake rate, 0.22 mL/min; Sample uptake delay, 45 s; Stabilization delay, 30 s; Integration time, 15 s; Replicates, 7; Background correction, Fitted; Selected wavelengths (nm), Al (308.215, 394.401, and 396.152), Lu (291.139); Rinse time, 40 s.

Whole-rock geochemical and mineral composition analyses were carried on at the SKLaBIG GIGCAS. Major elements were measured on individual minerals using a JEOL JXA-8100 Superprobe with an accelerating potential of 15 kV and sample current of 20 nA. Whole-rock major element oxides (wt.%) for whole-rock powders were determined using a Varian Vista PRO ICP-AES using wavelength X-ray fluorescence spectrometry with analytical errors better than 2%. Whole-rock trace elements, including the REEs, were analysed using a Perkin-Elmer ELAN 6000 inductively-coupled plasma source mass spectrometer (ICP-MS). Analytical precision for most elements is better than 3%. Whole-rock Sr and Nd isotopic compositions of selected samples were determined using a Micromass Isoprobe multi-collector mass spectrometer (MC-ICP-MS). The ⁸⁷Sr/⁸⁶Sr ratio of the NBS987 standard and ¹⁴³Nd/¹⁴⁴Nd ratio of the Shin Etsu JNdi-1 standard measured were 0.710288±28 (2σ) and 0.512109±12 (2σ), respectively. All measured ¹⁴³Nd/¹⁴⁴Nd and ⁸⁶Sr/⁸⁸Sr ratios are fractionation corrected to ¹⁴⁶Nd/¹⁴⁴Nd=0.7219 and ⁸⁶Sr/⁸⁸Sr=0.1194, respectively.

B and B isotopes were analyzed at GIG-CAS^{62 ,63} . B concentrations for the ‘Non-POOL’ sample was measured on a Varian Vista Pro ICP-AES, equipped with an HF-resistant Teflon spray chamber and an Al₂O₃ injector. B was measured using the 249.772 nm spectral line. B-5, JB-2, JB-3 and JR-2 were chemically prepared with the samples and used as external standards for calibrating B concentrations. The analytical precision for our B concentration measurements was generally better than 5% (RSD). B isotope measurements were performed using the Finnegan Neptune MC-ICPMS in sample-standard-bracketing (SSB) mode. NIST SRM 951 dissolved in B-free Milli-Q deionized water was used as the bracketing standard, and the results of measured samples were expressed as δ¹¹B relative to SRM 951⁶² . The internal precision for δ¹¹B was better than ±0.05‰ (1SE), and external precision for δ¹¹B is better than ±0.40‰ (1 SD) based on our long-term results for SRM 951. The standard reference samples B-5, B-6, JB-2, AGV-2, and JR-2 were repeatedly prepared and analyzed along our unknowns to monitor the quality of the B isotope measurements. Measured δ¹¹B values for the reference samples were: AGV-2: −4.36 ± 0.68‰ (2 SD, n = 3); B-5: −4.71 ± 0.49‰ (2 SD, n = 9); B-6: −2.86 ± 0.62‰ (2 SD, n = 9); JB-2: +7.29 ± 0.60‰ (2 SD, n = 9); JB-3: 6.74 ± 0.09‰ (2 SD, n = 2); and JR-2: 3.10 ± 0.77 ‰ (2 SD, n = 11).