Quinine sulfate dihydrate

As with spectrophotometers, NIST provides a number of SRMs for use in the calibration or verification of the performance of fluorometers or fluorospectrophotometers. These include SRM 936a (quinine sulfate dihydrate) for calibrating such instruments and SRM 1932 (fluorescein) for establishing a reference scale for fluorescence measurements (see http //www.nist.gov). 

Numerical values of the corrected fluorescence spectrum of quinine sulfate can be found in Velapoldi R. A. and Mielenz K. D. (1980) Standard reference materials A fluorescence SRM quinine sulfate dihydrate (SRM 936), NBS Spec. Publ. 260-64, Jan. 1980, PB 80132046, (NTIS), Springfield, VA, USA. Samples of quinine sulfate dihydrate can be ordered from the Standard Reference Materials Program, National Institute of Standards and Technology, Gaithersburg, MD 20678-9950, USA. 

Quinine sulfate. See Quinine bisulfate Quinine sulfate dihydrate CAS 6119-70-6 EINECS/ELINCS 212-359-2 UN 2811 FEMA 2977... 

Quinine sulfate (2 1) dihydrate. See Quinine sulfate dihydrate Quinizarin... 

Dinitronaphthalene Picric acid muscle relaxant Quinine sulfate dihydrate muscle relaxant, pharmaceuticals Guaifenesin... 

Quinine sulfate dihydrate 212-377-0 Dymel 134a Forane 134a Genetron 134a KLEA 134a Suva Cold-MP Suva Trans A/C Tetrafluoroethane 212-390-1 Bismuth citrate 212-391-7 Calcium citrate Gadocal+... 

Figure 9.4. Comparison of the standard relative fluorescence intensity (in units of quinine sulfate dihydrate equivalent) to HKem. Muck soils and mineral soils were treated by air drying, oven drying, and fumigation and then extracted aqueously for fluorescence analysis. The fulvic acid fraction of each soil was obtained with NaOH pyrophosphate. This plot shows the different signals from the field fresh (f.f), air dried (a.d.), oven dried (o.d.), and fumigated samples, indicating drying processes release different fractions of organic matter. (From Zsolnay et al., 1999.)...

Quinine sulphate (2 1) salt dihydrate Quinine Sulphate BP Quinine sulfate USP Quinine... 

Fluorescence is an extremely sensitive technique but it is not suitable as a general method to estimate natural DOC content due to the reason that it is impossible to find a reference material that would be common for all different natural waters. Characteristic for different fluorescence studies of NOM/DOM is that they may occasionally be somewhat surprising, contradictory, or laboriously explicable. The main reason for this incoherence is that fluorescence measurements are affected by many environmental factors, e.g., type of solution, pH, ionic strength, temperature, redox potential of the medium, and interactions with metal ions and organics. Several corrections are required to obtain a reliable and comparable spectrum, e.g., instrumental factors, Raman water peak, scattering effects (primary and secondary inner filter effects [31,32]), arbitrary fluorescence units should be standardized (dihydrate of quinine sulfate), etc. 

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