Agilent 8800 inductively coupled plasma mass spectrometer

The TIMS instrument used are described elsewhere^{6 (link)} but schematic diagram of the ⁹⁰Sr measurement method (Fig. 11), layout of the Phoenix X62 TIMS (Fig. 12) and ⁹⁰Sr detection in the TIMS analyser section (Fig. 13) are presented here:Figure 11

The schematic diagram of ⁹⁰Sr analysis method using mass spectrometry instruments.

Figure 12

The layout of the Phoenix X62 TIMS.

Figure 13

Multi-collector assembly and detector set up of the Phoenix62 TIMS for ⁹⁰Sr analysis.

During the measurement, ⁸⁶Sr ion beam is detected, while ⁸⁸Sr ion beam is not collected by any Faraday cups and directed into the analyser wall. The ⁹⁰Sr/⁸⁸Sr isotope ratio is calculated from the measured ⁹⁰Sr/⁸⁶Sr ratio^{6 (link)}. With this method, ⁹⁰Sr ion beam is detectable on the Daly ion-counting detector in samples where ⁹⁰Sr/⁸⁸Sr isotope ratio is in the range of 10⁻⁹ and 10⁻¹⁰ as it occurs in many environmental samples.
For stable strontium concentration determination, Agilent-8800 inductively coupled plasma mass spectrometer (Agilent Technologies, USA) was used. The detailed strontium analysis method is described elsewhere^{25 (link)}.

Inductively coupled plasma mass spectrometry (ICP-MS) was used to measure the total hepatic iron content. Briefly, microwave dissolution of the liver samples was performed with 4.0 mL of concentrated HNO₃ using 100 mg of tissue, followed by quantitative transfer and dilution using 2% HNO₃. Tissue microwave dissolution was accomplished by application of up to 1600 W power, 200°C for 35 min utilizing a Microwave-Accelerated Reaction System Model MARS-X (CEM Corporation, Matthews, NC). The iron content was determined with an Agilent 8800 Inductively Coupled Plasma mass spectrometer (Santa Clara, CA), utilizing the ⁵⁶Fe isotope. ⁴⁵Sc, at 100 ng/mL, was used as an internal standard. Helium collision cell gas was used for the elimination of argon oxide (⁴⁰Ar¹⁶O⁺) poly atomic interferences.