GEOTRACES inter-calibration of the stable silicon isotope composition of dissolved silicic acid in seawater
|Author(s)||Grasse Patricia1, 2, Brzezinski Mark A.2, Cardinal Damien3, de Souza Gregory F.4, Andersson Per3, Closset Ivia3, Cao Zhimian6, Dai Minhan6, Ehlert Claudia7, Estrade Nicolas8, 15, Francois Roger8, Frank Martin, Jiang Guibin9, Jones Janice L.2, Kooijman Ellen5, Liu Qian9, Lu Dawei9, Pahnke Katharina7, Ponzevera Emmanuel10, Schmitt Melanie5, Sun Xiaole11, 16, Sutton Jill12, Thil Francois13, Weis Dominique8, Wetzel Florian4, Zhang Anyu14, Zhang Jing14, Zhang Zhouling6|
|Affiliation(s)||1 : GEOMAR, Helmholtz Ctr Ocean Res Kiel, Ocean Circulat & Climate Dynam, Wischhofstr 1-3, D-24148 Kiel, Germany.
2 : Univ Calif Santa Barbara, Inst Marine Sci, Dept Ecol Evolut & Marine Biol, Santa Barbara, CA 93106 USA.
3 : Univ Paris 06, Sorbonne Univ UPMC, CNRS IRD MNHN, LOCEAN Lab, 4 Pl Jussieu, F-75005 Paris, France.
4 : Swiss Fed Inst Technol, Inst Geochemistry & Petr, Clausiusstrasse 25, CH-8092 Zurich, Switzerland.
5 : Swedish Museum Nat Hist, Dept Geosci, S-10405 Stockholm, Sweden.
6 : Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China.
7 : Carl von Ossietzky Univ Oldenburg, Inst Chem & Biol Marine Environm ICBM, Max Planck Res Grp Marine Isotope Geochem, Carl Von Ossietzky Str 9-11, D-26129 Oldenburg, Germany.
8 : Univ British Columbia, Pacific Ctr Isotop & Geochem Res, Dept Earth Ocean & Atmospher Sci, Vancouver, BC V6T IZ4, Canada.
9 : Chinese Acad Sci, Res Ctr Eco Environm Sci, State Key Lab Environm Chem Ecotoxicol, 18 Shuangqing Rd, Beijing 100085, Peoples R China.
10 : Unit Rech Geosci Marines, IFREMER, F-29870 Plouzane, France.
11 : Stockholm Univ, Dept Environm Sci & Analyt Chem, Stockholm, Sweden.
12 : Univ Brest, CNRS, IRD, IFREMER,LEMARIUEM, Rue Dumont Urville, Plouzane, France.
13 : LSCE IPSL, Lab CEA CNRS UVSQ, Lab Sci Climat & Environm, Domaine CNRS, Bat 12,Ave Terrasse, F-91198 Gif Sur Yvette, France.
14 : China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China.
15 : LEGOS, Equipe TIM, Observ Midi Pyrenes, 14 Edouard Belin, F-31400 Toulouse, France.
16 : Stockholm Univ, Balt Sea Ctr, S-10691 Stockholm, Sweden.
|Source||Journal Of Analytical Atomic Spectrometry (0267-9477) (Royal Soc Chemistry), 2017-03 , Vol. 32 , N. 3 , P. 562-578|
|WOS© Times Cited||31|
The first inter-calibration study of the stable silicon isotope composition of dissolved silicic acid in seawater, delta Si-30(OH)(4), is presented as a contribution to the international GEOTRACES program. Eleven laboratories from seven countries analyzed two seawater samples from the North Pacific subtropical gyre (Station ALOHA) collected at 300 m and at 1000 m water depth. Sampling depths were chosen to obtain samples with a relatively low (9 mmol L-1, 300 m) and a relatively high (113 mmol L-1, 1000 m) silicic acid concentration as sample preparation differs for low- and highconcentration samples. Data for the 1000 m water sample were not normally distributed so the median is used to represent the central tendency for the two samples. Median delta Si-30(OH)(4) values of +1.66& for the low-concentration sample and +1.25& for the high-concentration sample were obtained. Agreement among laboratories is overall considered very good; however, small but statistically significant differences among the mean isotope values obtained by different laboratories were detected, likely reflecting inter-laboratory differences in chemical preparation including pre-concentration and purification methods together with different volumes of seawater analyzed, and the use of different mass spectrometers including the Neptune MC-ICP-MS (Thermo Fisher (TM), Germany), the Nu Plasma MC-ICP-MS (Nu Instruments (TM), Wrexham, UK), and the Finnigan (TM) (now Thermo Fisher (TM), Germany) MAT 252 IRMS. Future studies analyzing delta Si-30(OH)(4) in seawater should also analyze and report values for these same two reference waters in order to facilitate comparison of data generated among and within laboratories over time.