Reeves J B
AMBPL, ARS, USDA, BARC East Beltsville, Maryland 20705, USA.
Poult Sci. 2001 Oct;80(10):1437-43. doi: 10.1093/ps/80.10.1437.
The objective of this study was to determine if accurate calibrations for mineral content in dried poultry manures could be developed using near- or mid-infrared spectra. Samples (n = 124) were obtained from a commercial testing laboratory along with conventionally determined values for Ca, Cu, K, Mg, Mn, P, S, and Zn. Samples were blended in a food blender, dried at 60 C, ground to 20 mesh, and scanned in the near-infrared (rotating sample cup) on a scanning monochromator. Samples were also scanned in the mid-infrared on a Fourier transform spectrometer using a custom-made sample transport. Results showed that calibrations based on nearor mid-infrared spectra were not satisfactory for the accurate determination of Ca, Cu, K, Mg, Mn, P, S, or Zn in dried poultry manures. At best, most of the calibrations would be suitable for only gross estimates, although the mid-infrared calibration for P might be suitable for some needs in which only a limited degree of accuracy was needed. Either spectral range could be used to separate dried poultry manure samples into those containing less than 3% and greater than 8% Ca but not to accurately differentiate samples within those two groupings. Finally, although the mid-infrared calibrations were the more accurate for five of the eight minerals studied, the differences between the two sets of calibrations were so varied that it would be difficult to say that one region is better for mineral content measurement.
本研究的目的是确定是否可以使用近红外或中红外光谱对干禽粪中的矿物质含量进行准确校准。从一家商业检测实验室获取了124个样本，并获得了钙、铜、钾、镁、锰、磷、硫和锌的常规测定值。将样本在食品搅拌机中混合，在60℃下干燥，研磨至20目，然后在扫描单色仪上进行近红外扫描（旋转样品杯）。还使用定制的样品传输装置在傅里叶变换光谱仪上对样本进行中红外扫描。结果表明，基于近红外或中红外光谱的校准对于准确测定干禽粪中的钙、铜、钾、镁、锰、磷、硫或锌并不令人满意。充其量，大多数校准仅适用于粗略估计，尽管磷的中红外校准可能适用于某些只需要有限精度的需求。两种光谱范围都可用于将干禽粪样本分为钙含量低于3%和高于8%的两类，但无法准确区分这两组内的样本。最后，尽管在所研究的八种矿物质中，中红外校准对其中五种更为准确，但两组校准之间的差异变化很大，因此很难说一个区域在矿物质含量测量方面更好。
