Ion probe measurements of carbon and nitrogen in iron meteorites

ION-PROBE MEASUREMENT OF Os, Ir, Pt, AND Au ABUNDANCES IN IRON METEORITES

Introduction: At last yearÕs LPSC meeting, we described our first attempts to collect abundance data for Os, Ir, Pt, and Au in iron meteorites and chondritic metal [1-3]. We described a technique which gives measurable signals of negative Os, Ir, Pt, and Au ions from ~10 micron spots while all interferences are resolved or suppressed. At that time, we showed that PGE data for meteoritic metal m...

Internal Friction Characteristics of Interstitial Carbon and Nitrogen in -iron

application and construction of carbon paste modified electrodes developed for determination of metal ions in some real samples

ساخت الکترودهاِی اصلاح شده ِیکِی از چالشهاِی همِیشگِی در دانش شیمِی بوِیژه شیمِی تجزیه مِی باشد ،که با در نظر گرفتن سادگِی ساخت، کاربردی بودن و ارزان بودن روش مِی توان به باارزش بودن چنِین سنسورهاِی پِی برد.آنچه که در ادامه آورده شده به ساخت و کاربرد الکترودهاِی اصلاح شده با استفاده از نانو ذرات در اندازه گِیرِی ولتامترِی آهن وکادمِیم اشاره دارد. کار اول اختصاص دارد به ساخت الکترود خمِیر کربن اصلاح شده با لِیگاند داِ...

Microanalysis of Niobium in Iron Meteorites

Introduction: Niobium and tantalum are generally regarded to be lithophile incompatible elements occurring in chondritic relative proportions in planetary materials [1]. Precise Nb/Ta data have indicated that Nb may be depleted in the Earth's mantle [2, 3] which may be evidence for sequestering in an eclogite reservoir [2], or for its removal into the core [3, 4]. Metal-silicate partitioning ex...

Determining cooling rates of iron and stony-iron meteorites from measurements of Ni and Co at kamacite–taenite interfaces

Analyses and modeling of Ni zoning in taenite in differentiated meteorites provide metallographic cooling rates at 500 C that are inconsistent with conventional formation models. Group IVA iron meteorites have very diverse cooling rates of 100–6600 C/Myr indicating that they cooled inside a large metallic body with little or no silicate mantle (Yang et al., 2007). Wasson and Hoppe (2012) have q...