The best-modified BCR and Tessier with microwave-assisted methods for leaching of Cu/Zn and their <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e3773" altimg="si2.svg"> <mml:mi>δ</mml:mi> </mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e3778" altimg="si3.svg"> <mml:msup> <mml:mrow/> <mml:mrow> <mml:mn>65</mml:mn> </mml:mrow> </mml:msup> </mml:math> Cu/ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e3786" altimg="si2.svg"> <mml:mi>δ</mml:mi> </mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e3792" altimg="si5.svg"> <mml:msup> <mml:mrow/> <mml:mrow> <mml:mn>66</mml:mn> </mml:mrow> </mml:msup> </mml:math> Zn for tracing sources in marine sediment fraction
Anugrah Ricky Wijaya, Fitri Khoerunnisa, Alrum Armid, Retno Ariadi Lusiana
Abstract
The optimum condition of modified BCR and Tessier with microwave-assisted (m-a) methods for leaching of Cu and Zn in the sediment Certified Reference Material (CRM) was investigated and then applied to those in marine sediments. Samples were leached by modified BCR and Tessier with (m-a) methods to perform Cu and Zn analysis in each sediment fraction (CRM) by means of ICP-MS. The irradiation power (336 watts) of 50%-2 min (fraction 1), 50%-3 min (fraction 2), 50%-1 min (fraction 3), and 50%-3 min (fraction 4) were observed in the optimum condition of the microwave. The best-modified BCR with (m-a) method was in the range 1.43–10.8% RSD (90.8% recovery) for Cu and 0.40–1.29% RSD (98.6% recovery) for Zn. The optimum condition in the modified Tessier with (m-a) method was also observed in the irradiation power (336 watts) of 50%-1 min (fraction 1), 30%-3 min (fraction 2), 30%-3 min (fraction 3), 50%-1 min (fraction 4), 30%-2 min (fraction 5). The best range precision (accuracy) in the optimized condition with (m-a) was recorded as leaching Cu in the range of 0.62–1.65% RSD (98.8% recovery) and Zn in the range of 1.35–6.06% RSD (92.7% recovery). Both of the best-modified methods were then applied to marine sediment of the Java Sea and measured their Cu and Zn isotopes fractionations by the recommended MC-ICP-MS. Considering treated Cu and Zn isotope fractionations by δ65Cu calculated in the range 3–4.5‰ reflecting the source of their Cu and Zn from natural sediments.