瑞士步琦双一流高校定制方案专题--农林科学篇

1、基于近红外光谱技术快速定性鉴别广陈皮模型的建立

摘 要：目的 采用近红外光谱技术（NIRS）建立广陈皮的定性分析模型，以建立快速鉴别广陈皮药材的方法。 方法 采集广陈皮与川陈皮的NIRS 图，通过标准正交变量变换（SNV）预处理后采用聚类分析方法建立广陈皮与川陈皮鉴别模型，并进行模型内验证和模型外验证，建立了广陈皮定性分析模型。结果 在4 000～10 000 cm−1 广陈皮和川陈皮能够较好地区分，内部验证的准确率高达100%，外部验证准确率达到90.91%。结论 采用近红外光谱技术对广陈皮样品进行鉴别是可行的。

关键词：近红外光谱技术；广陈皮；定性鉴别；川陈皮；聚类分析

中图分类号：R282.5 文献标志码：A 文章编号：0253 - 2670(2015)20 - 3096 - 04

DOI: 10.7501/j.issn.0253-2670.2015.20.023

2、近红外光谱分析测定鱼丸中的水分和淀粉含量

3、利用近红外光谱技术快速测定白鲢鱼糜中的水分含量

4、Sher (1998) - Microencapsulation of pesticides

Abstract : Interfacial polymerization microcapsulation processes based on isocyanate or aminoplast chemistry, where all wall-forming reactants are placed in the dispersed oil phase are described. Emphasis is placed on mechanism of interfacial reactions, physical nature of the resulting membranes and methods used to vary membrane permeability. Pesticide microcapsule formulations can be used to reduce mammalian toxicity and extend activity, to control evaporation, to reduce phytotoxicity, to protect pesticide from rapid environmental degradation, to reduce leaching and to reduce pesticide levels in the environment. Examples are provided to demonstrate how pesticide performance characteristics can be altered using this type of formulation. ( 1998 Society of Chemical Industry

Pestic. Sci., 54, 394È400 (1998)

Key words: microcapsule formulations ; isocyanate/aminoplast wall-forming reagents

见图一

5、土壤中硫化物的测定

本应用根据环境保护标准HJ833-2017测定了一种土壤样品中的硫化物含量。样品经过酸化，硫化物转化为硫化氢气体蒸馏出来，被氢氧化钠溶液吸收。再与N, N-二甲基对苯二胺反应生成亚甲基蓝后，测量其吸光度值计算出硫化物含量。

见图二

6、土壤中微量氮的测定

7、k-436-439-370硝酸盐肥料中氮含量的测定

The determination of nitrogen in fertilizers is a routine procedure for quality assurance and labelling. A simple and fastprocedure for nitrogen determination in nitrate containing fertilizers according to the Kjeldahl method as described in the AOAC 955.04-D regulations, is introduced. The nitrate is converted into amine using sulphuric acid and salicylic acid prior to digestion using the SpeedDigester K-436 or K-439, followed by distillation and titration with the Kjeldahl Sampler System K-370/K-371. The determined nitrogen contents were in accordance with the labelled values.

8、Selective_nitrogen_determination_0-fertilizer.

Introduction

85 % of the world’s nitrogen demand for fertilizer is primarily derived from ammonia in the form of urea, ammonium nitrate, phosphate and sulfate [1]. Ammoniacal components can also be found in soil, sludge and bio waste. In those sample matrices, a mixture of several nitrogen containing compounds as urea, nitrogen from other organic origin such as amino acids, proteins, nitrate, nitrite and ammonium can be found. Using the Kjeldahl equipment, selective nitrogen determination of the Total Kjeldahl Nitrogen (TKN and TKN+), the ammonium (ammonium distillation) and the nitrate concentration (Devarda distillation) of a sample is possible. In addition, to these parameters, the organic nitrogen content can be calculated.