Niacin (nicotinic acid) in hydrochloric acid is highly suitable for checking the photometric accuracy of spectrometers in the UV range. The Niacin spectrum shows a relatively broad maximum at the wavelengths 213 nm and 261 nm.
The Niacin filter solutions are filled and immediately fused under controlled conditions to become permanently airtight.
The Niacin liquid filters are used for checking the photometric accuracy (absorbance) and the photometric linearity in the UV-range, according to the requirements of the European Pharmacopoeia (EP 11) and the United States Pharmacopeia (USP 857).
Typical scanlines of Niacin liquid filters, measured at a slit width of 1 nm.
|UV506||667506||6 mg/L Niacin in HCl (ca. 0.25 Abs)|
|UV512||667512||12 mg/L Niacin in HCl (ca. 0.5 Abs)|
|UV518||667518||18 mg/L Niacin in HCl (ca. 0.75 Abs)|
|UV524||667524||24 mg/L Niacin in HCl (ca. 1.0 Abs)|
|UV536||667536||36 mg/L Niacin in HCl (ca. 1.5 Abs)|
|UV548||667548||48 mg/L Niacin in HCl (ca. 2.0 Abs)|
|UV599||667599||Hydrochloric acid (HCl), reference filter|
|UV350||667350||Filter-Set includes 6, 12, 18, 24 mg/L Niacin and reference filter|
|S501||667S501||Filter-Set includes 6, 12, 24 mg/L Niacin and reference filter|
|Standard Measurement||Wavelengths: 213 nm and 261 nm |
Slit width: 1 nm; with DAkkS calibration certification
|Possible Measurements||Wavelength: fix |
Slit width: all up to 2 nm
The individually measured absorbance values are free from any systematic errors. The measured data of the reference filter UV599 (hydrochloric acid measured against air) appears separately on the calibration certificate.
To check photometric linearity, perform the measurement with Niacin filters of different concentrations. List the measured absorbance values for each filter and each wavelength in a diagram and calculate the correlation coefficient.
To help you with the determination of the photometric linearity, we have created an excel file (tool) for the evaluation of your measurement values.