Description
Specifications Table
Product Name – Selenium 78, 78Se, plasma standard solution, Specpure®, 10µg/ml
Quantity/Pack Size – 50ml
Form – Liquid (1-2% HNO₃ matrix)
Grade – Specpure® (ultra-high purity, 99.999% trace metal basis)
Application – ICP-MS/AES calibration, isotope ratio analysis, plasma spectrometry
Product Overview
This Specpure® selenium-78 plasma standard solution delivers unmatched purity and precision for advanced spectroscopic applications. Formulated at a 10µg/ml concentration in a stabilized 1-2% nitric acid matrix, it ensures minimal matrix interference and long-term stability for critical analytical workflows. The solution undergoes rigorous multi-stage purification to eliminate trace contaminants, achieving a 99.999% trace metal basis purity that exceeds ASTM Type I standards. Each batch is individually certified with NIST-traceable documentation, guaranteeing ±1% accuracy in selenium-78 isotopic composition. The amber glass packaging with PTFE-lined cap prevents leaching and photodegradation, while the nitrogen-purged headspace maintains oxidative stability during storage. Designed for seamless integration with modern ICP-MS/AES systems, this standard eliminates the need for complex sample preparation, reducing procedural errors in quantitative analysis. The solution’s homogeneous isotopic distribution ensures reproducible results across multiple dilutions, making it particularly valuable for low-level selenium detection in environmental and biological matrices where interference from other selenium isotopes (74Se, 76Se, 80Se, 82Se) must be minimized.
FAQs
1. What matrix components are present in this selenium-78 standard solution?
The solution contains 1-2% ultra-pure nitric acid as the primary matrix component, with residual water content below 0.05%. No organic stabilizers or preservatives are added to maintain spectral purity.
2. How does the Specpure® grade differ from standard ACS reagent grade for selenium standards?
Specpure® undergoes additional zone refining and sub-boiling distillation steps that reduce metallic impurities to sub-ppt levels, whereas ACS grade typically contains 10-100x higher trace contaminants. This makes Specpure® suitable for isotope ratio measurements where spectral interferences must be eliminated.
3. Can this solution be used directly for triple quadrupole ICP-MS without further dilution?
For most triple quadrupole systems, the 10µg/ml concentration is optimal for mid-range calibration. However, for ultra-trace analysis below 100 ppt, a 1:100 dilution with 1% HNO₃ is recommended to maintain signal linearity and prevent detector saturation.
4. What is the typical shelf life when stored under recommended conditions?
When stored unopened at 15-25°C in the original container, the solution maintains its certified concentration for 24 months. After opening, the stability is 12 months if the bottle is resealed under nitrogen and protected from light exposure.
5. Are there specific isotopes of selenium that could interfere with 78Se measurements when using this standard?
The most significant potential interferents are 77Se (from 77SeH+ formation) and 78Kr (from argon plasma gas). This standard is pre-tested to ensure 77Se content is below 0.001% of the 78Se concentration, while krypton interference can be eliminated through collision cell technology in modern ICP-MS instruments.
