Description
Specifications Table
Product Name – Lithium, plasma standard solution, Specpure®, Li 1000µg/ml Quantity/Pack Size – 50ml, 100ml, 500ml Form – Liquid (1% HNO₃ matrix) Grade – Specpure® (ultra-high purity) Application – ICP-OES, ICP-MS, AAS calibration
Product Overview
This Specpure® lithium plasma standard solution delivers 1000µg/ml lithium in a 1% nitric acid matrix, engineered for exceptional purity and consistency in atomic spectroscopy applications. The solution undergoes rigorous multi-stage purification to eliminate metallic and anionic contaminants, ensuring baseline stability and minimal matrix interference during analysis. Each batch is quantitatively certified against NIST-traceable reference materials with ±0.5% relative uncertainty, providing reliable calibration for ICP-OES, ICP-MS, and flame AAS instruments. The nitric acid matrix (1% v/v) maintains elemental stability for 24+ months when stored at 15-25°C, with the amber HDPE bottle and PTFE-lined cap preventing photodegradation or leaching. Unlike generic standards, Specpure® grade guarantees sub-ppb levels of alkaline/alkaline earth metal impurities (Na, K, Ca, Mg <10ppb), critical for low-level lithium determinations in geological, environmental, or biological matrices. The solution’s homogeneous composition eliminates settling or phase separation, while the certified concentration accounts for moisture content and density variations. Compatible with most autosampler systems, this standard requires no dilution for mid-range lithium analysis but can be serially diluted with 1% HNO₃ for lower concentrations without compromising linearity.
FAQs
1. What is the shelf life of this lithium plasma standard after opening?
The solution remains stable for 24 months from the date of manufacture when stored unopened at 15-25°C. After opening, recap tightly and use within 6 months to prevent concentration changes from evaporation or contamination. For extended storage, transfer aliquots to smaller PTFE-sealed vials.
2. Can this standard be used for lithium isotope ratio analysis?
While the 1000µg/ml concentration is suitable for bulk lithium determination, isotope ratio work requires additional considerations. The nitric acid matrix does not fractionate isotopes, but the standard’s natural lithium composition (≈92.5% ⁷Li, 7.5% ⁶Li) may need correction if analyzing enriched or depleted samples. For high-precision isotope studies, verify matrix matching with your sample type.
3. How does the Specpure® grade differ from ACS or reagent-grade lithium standards?
Specpure® standards undergo zone refining and sub-boiling distillation to achieve sub-ppb impurity levels for critical elements (e.g., Na <5ppb, K <3ppb), whereas ACS grade typically allows ppm-level contaminants. The certification process for Specpure® includes direct comparison against NIST SRMs using ID-ICP-MS, providing lower measurement uncertainty (±0.5% vs ±2% for ACS). This grade is essential when analyzing lithium in complex matrices like silicate rocks or serum where spectral overlaps from sodium/potassium could interfere.
4. Is this standard compatible with organic solvents for extraction methods?
The aqueous nitric acid matrix is immiscible with most organic solvents (e.g., hexane, chloroform). For solvent extraction applications, evaporate an aliquot to dryness under nitrogen at <60°C, then reconstitute in your organic phase. Note that lithium nitrate may precipitate during evaporation; redissolve in minimal water before transferring to the organic solvent.
5. What documentation is provided with each batch for quality assurance?
Each bottle includes a certificate of analysis listing the certified lithium concentration, expanded uncertainty, expiry date, and batch-specific impurity profile (ICP-MS screening for 30+ elements). Traceability documentation links the batch to the primary NIST SRM 3104a (Li carbonate) used for standardization. Lot-specific chromatograms and stability test data are available upon request for regulatory compliance.
