當(dāng)前位置：武漢上譜分析科技有限責(zé)任公司>>激光微區(qū)原位S同位素分析>>激光微區(qū)原位S同位素分析同位素質(zhì)譜儀

激光微區(qū)原位S同位素分析同位素質(zhì)譜儀

返回列表頁(yè)

參考價(jià)

面議

具體成交價(jià)以合同協(xié)議為準(zhǔn)

產(chǎn)品型號(hào)

品牌

廠商性質(zhì)其他

所在地

在線詢價(jià) 收藏產(chǎn)品

聯(lián)系方式：陳紅芳查看聯(lián)系方式

更新時(shí)間：2023-03-01 09:08:10瀏覽次數(shù)：246次

聯(lián)系我時(shí)，請(qǐng)告知來(lái)自儀表網(wǎng)

產(chǎn)品分類 品牌分類

  激光微區(qū)原位S同位素分析

全部產(chǎn)品列表

暫無(wú)信息

武漢上譜分析科技有限責(zé)任公司

經(jīng)營(yíng)模式：其他

商鋪產(chǎn)品：30條

所在地區(qū)：湖北武漢市

聯(lián)系人：陳紅芳

詢價(jià) 給他留言

產(chǎn)品簡(jiǎn)介

測(cè)試項(xiàng)目：S同位素測(cè)試對(duì)象：黃鐵礦、黃銅礦、磁黃鐵礦等測(cè)試周期：來(lái)電詳詢送樣要求：樣品靶或巖石薄片，薄片尺寸參見原位主微量元素分析要求

詳細(xì)介紹

測(cè)試項(xiàng)目：S同位素

測(cè)試對(duì)象：黃鐵礦、黃銅礦、磁黃鐵礦等
測(cè)試周期：來(lái)電詳詢
送樣要求：樣品靶或巖石薄片，薄片尺寸參見原位主微量元素分析要求。
完成標(biāo)準(zhǔn)：測(cè)試內(nèi)精度及標(biāo)樣外精度和準(zhǔn)確度確保達(dá)到國(guó)際水平。

方法描述：

22.1硫化物LA-MC-ICP-MS微區(qū)原位S同位素比值測(cè)試

微區(qū)原位硫化物硫同位素比值測(cè)試在武漢上譜分析科技有限責(zé)任公司利用激光剝蝕多接收杯電感耦合等離子體質(zhì)譜（LA-MC-ICP-MS）完成。激光剝蝕系統(tǒng)為Geolas HD（Coherent，德國(guó)），MC-ICP-MS為Neptune Plus（Thermo Fisher Scientific，德國(guó)）。激光剝蝕系統(tǒng)使用氦氣作為載氣。分析采用單點(diǎn)模式，為了解決分析過(guò)程中硫同位素比值的Down Hole分餾效應(yīng)（Fu et al. 2016），選擇采用大束斑（44微米）和低頻率（2Hz）的激光條件，單次分析約剝蝕100個(gè)激光脈沖。同時(shí)配備了信號(hào)平滑裝置（Hu et al. 2015），確保在低頻率條件下獲得穩(wěn)定的信號(hào)。激光能量密度固定5.0 J/cm²。質(zhì)譜儀Neptune Plus配備9個(gè)法拉第杯和10¹¹歐姆電阻放大器，采用L3，C和H3三個(gè)法拉第杯同時(shí)靜態(tài)接收³²S，³³S和 ³⁴S信號(hào)。高性能的Jet+X錐組合被采用提高信號(hào)強(qiáng)度。氮?dú)猓? ml/min）被引入等離子體降低多原子離子干擾。中分辨模式（約5000）被采用。
硫同位素質(zhì)量分餾采用SSB方法校正。為避免基體效應(yīng)，黃鐵礦、磁黃鐵礦、鎳黃鐵礦等樣品采用黃鐵礦參考物質(zhì)PPP-1校正。黃銅礦樣品采用國(guó)家黃銅礦標(biāo)準(zhǔn)物質(zhì)GBW07268的粉末壓片校正。硫化銀樣品采用國(guó)際硫化銀標(biāo)準(zhǔn)物質(zhì)IAEA-S-1的粉末壓片校正。以上樣品δ³⁴S_v-CDT推薦值請(qǐng)參考Fu et al.（2016）。測(cè)試過(guò)程中，實(shí)驗(yàn)室內(nèi)部磁黃鐵礦參考物質(zhì)SP-Po-01（δ³⁴S_v-CDT=1.4±0.4），黃銅礦參考物質(zhì)SP-CP-01（δ³⁴S_v-CDT=5.5±0.3）和國(guó)際硫化銀標(biāo)準(zhǔn)物質(zhì)IAEA-S-2（δ³⁴S_v-CDT=22.58±0.39）和IAEA-S-3（δ³⁴S_v-CDT=-32.18±0.45）作為質(zhì)量監(jiān)控樣品被重復(fù)分析，驗(yàn)證實(shí)驗(yàn)方法的準(zhǔn)確性。詳細(xì)的儀器操作條件和分析測(cè)試方法可以參考Fu et al.（2016）。全部分析數(shù)據(jù)采用專業(yè)同位素?cái)?shù)據(jù)處理軟件“Iso-Compass”進(jìn)行數(shù)據(jù)處理（Zhang et al., 2020)。

22.2 In-situ S isotope analysis of sulfide by using LA-MC-ICP-MS

In situ sulfur isotope analyses of sulfide were performed on a Neptune Plus MC-ICP-MS (Thermo Fisher Scientific, Bremen, Germany) equipped with a Geolas HD excimer ArF laser ablation system (Coherent, Göttingen, Germany) at the Wuhan Sample Solution Analytical Technology Co., Ltd, Hubei, China. In the laser ablation system, helium was used as the carrier gas for the ablation cell and was mixed with argon (makeup gas) after the ablation cell. The single spot ablation mode was used. Then the large spot size (44 μm) and slow pulse frequency (2 Hz) were used to avoid the down hole fractionation effect which have been reported by Fu et al. (2016). 100 laser pulses were completed in one analysis. A new signal-smoothing device was used downstream from the sample cell to efficiently eliminate the short-term variation of the signal, especially for the slow pulse frequency condition (Hu et al. 2015). The laser fluence was kept constant at ~5 J/cm². The Neptune Plus was equipped with nine Faraday cups fitted with 10¹¹Ω resistors. Isotopes ³²S, ³³S and ³⁴S were collected in Faraday cups using static mode. The newly designed X skimmer cone and Jet sample cone in Neptune Plus were used to improve the signal intensity. The nitrogen (4 ml/min) was added to the central gas flow to reduce the polyatomic interferences. All measurements were performed using the medium-resolution with a revolving power (as defined by a peak edge width from 5-95% of the full peak height) that was always greater than 5000.
A standard-sample bracketing method (SSB) was employed to correct for instrumental mass fractionation. To avoid the matrix effect, a pyrite standard PPP-1, a chalcopyrite standard GBW07268 (a pressed pellet) and a synthetic Ag₂S standard IAEA-S-1 (a pressed pellet) were chosen as reference materials for correcting the natural pyrite, pyrrhotite and pentlandite samples, the natural chalcopyrite samples and the natural Ag₂S samples, respectively. The reference values of δ³⁴S_v-CDT in these standards have been reported by Fu et al. (2016). In addition, the in-house references of a pyrrhotite SP-Po-01 (δ³⁴S_v-CDT=1.4±0.4), a chalcopyrite SP-CP-01 (δ³⁴S_v-CDT=5.45±0.3) and two synthetic Ag₂S standard IAEA-S-2 (δ³⁴S_v-CDT=22.58±0.39) and IAEA-S-3 (δ³⁴S_v-CDT=-32.18±0.45) were analyzing repeatedly as unknown samples to verify the accuracy of the calibration method. The more detail of the in situ Pb isotopic ratios analysis was described in Fu et al. (2016). All data reduction for the MC-ICP-MS analysis of S isotope ratios was conducted using “Iso-Compass” software (Zhang et al. 2020).
References
Fu, J., Hu, Z.C., Zhang, W., Yang, L., Liu, Y., Li, M., et al., 2016. In situ, sulfur isotopes (δ³⁴S and δ³³S) analyses in sulfides and elemental sulfur using high sensitivity cones combined with the addition of nitrogen by Laser Ablation MC-ICP-MS. Analytica Chimica Acta, 911, 14-26.
Hu, Z.C., Zhang, W., Liu, Y.S., Gao, S., Li, M., Zong, K.Q., Chen, H.H., Hu, S.H., 2015. “Wave” Signal-Smoothing and Mercury-Removing Device for Laser Ablation Quadrupole and Multiple Collector ICPMS Analysis: Application to Lead Isotope Analysis. Analytical Chemistry, 87(2), 1152–1157.
Zhang W., Hu Z.C., Liu Y.S. (2020). Iso-Compass: new freeware software for isotopic data reduction of LA-MC-ICP-MS. J. Anal. At. Spectrom., 2020, 35, 1087–1096.

關(guān)鍵詞：標(biāo)準(zhǔn) 等離子體質(zhì)譜質(zhì)譜儀