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  • Determining critical trace elements in high-purity phosphoric acid
    ) for the determination of Group 1 elements and inductively coupled plasma mass spectrometry (ICP-MS) for all others. A more recent study has reported the applicability of ICP-MS under standard plasma conditions to determine trace element levels in high-purity 37.5% hydrochloric acid at the 1-ppb
  • Evaluating reusable HDPE containers for delivery of high-purity hydrofluoric acid
    R. Thomas Talasek, Brian K. Hunt, and David C. Cooke, As semiconductor device geometries continue to shrink, the purity of process chemicals has become even more critical. Nowhere is this more evident than in the specifications for reducing metallic and particulate impurities, especially
  • Micro: Implementing enhanced ICP-MS technology to attain SEMI Grade 5 purity levels
    trace-element determinations in high-purity chemicals. It has been used successfully to determine impurities at the 100-ppt (Grade 4) level in hydrogen peroxide using SEMI methodology. Unfortunately, it does not have the capability to detect all 21 trace metals specified at the proposed H purity level of 10
  • Examining purification and certification strategies for high-purity C 2 F 6 process gas
    Charles C. Allgood and Jeremy D. Blanks, As the semiconductor industry shifts to using more-complex devices and finer geometries, the need grows for higher-purity process materials and gases. While manufacturing process improvements have provided the capability to consistently produce higher-purity
  • Power: pH and CO2 Determinations Based on Power Plant Conductivity Measurements
    Described here are capabilities to read out pH in real time based on calculations from specific and cation conductivity values. On cycle chemistry samples, calculated pH can be more accurate and more reliable than high purity pH measured with a conventional glass electrode. It is recognized
  • BSA Monomer-Dimer Elucidation with the BI-MwA (.pdf)
    on the Zimm equation and extrapolating the. without the need for column calibration. and to. light scattering data to zero angle. Naturally,. quantify the purity of a protein during method. extrapolation to zero concentration is impossible. development. since concentration dependent data is unavailable
  • Viscosity of Ionic Liquids
    Ionic liquids are employed as powerful, environmentally neutral. solvents and as electrically conducting fluids. Due to exact viscosity. determination with the Lovis 2000 M/ME microviscometer essential. information on their chemical structure, composition and purity can. be gained. C72IA010EN-A
  • MICRO: Critical Materials
    in the semiconductor industry. This trend is particularly apparent in the area of high-purity-chemical analysis. Chemical suppliers have been confronted with the rapidly changing demands of the semiconductor manufacturing process, particularly as codified in the International Technology Roadmap

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