首选气象色谱啦，定量定性

那么到底如何选择柿饼呢？我很迷茫，难道每次吃柿饼前，都要上液相测一把才能安心吃下去吗？

口罩，防护镜等。

通过做回收率确认方法的准确性。通过与成熟方法的测定结果比较来确定方法的准确性。

简单一点说流动相极性大于柱子极性

您是在那个地区啊，食品检验还要考虑样本传递的问题，可以优先考虑离你们比较近的实验室。

农残测试中，快速农残的测试误差怎样？用大型仪器（如GC，GC-MS等），测试误差怎样？

上面说的对，前处理重要。不知道你做的什么样本。山梨酸和苯甲酸用气相FID检测器做效果还是不错的。气相和液相的区别我认为是前处理前者麻烦，后者简单些。

肯定是a,b,c

不能，像霉菌的孢子状态就没有办法。

我这也有同样的问题，做标准系列时很正常，但是测量样品时峰就不好

好像没有国标，但市面上，可以用糖度计，用于快速测定含糖溶液以及其它非糖溶液的浓度或折射率。

能不能用氨基酸仪器测定氨基酸的组成分布来鉴别呢？

大家没有做油的吗？我的理解是写标准时，简写了。应该是指氢氧化钾-乙醇标准溶液

我们用的是紫外的。因为只是测亚硝和磷酸盐还是够用的。

两种方法对恒重的定义也不一样一个恒重要0.0005g以下一个要2mg以下足以不知道大家怎么看？

做克伦特罗时提取液pH值需要控制。

做其他基体时有些采用丙酮、乙腈，提取液中有水40度下很难旋干，要看水在提取液中的比例，还有与提取液中其他溶剂的互溶度，例如有时少量的水会被乙腈带走，也可旋干。有时也可加入无水硫酸钠除水。不知说的对不对，请大家指正

3.Determination of dimethoate and fenitrothion in estuarine samples by C-18 solid-phase extraction and high-resolution gas-chromatography with nitrogen-phosphorus detection V. K. Karamfilovb, a, T. W. Filemanb, K. M. Evansb and R. F. C. MantouraAnalytica Chimica Acta Volume 335, Issues 1-2, 10 December 1996, Pages 51-61 AbstractDimethoate [S-((2-(methylamino)ethyl)-2-oxoethyl)phosphorodithioate] and fenitrothion [O,O-dimethyl O-(4-nitro-m-tolyl)phosphorothioate], both organophosphorus pesticides (OPs), have been successfully enriched on monofunctional C-18 solid-phase extraction (SPE) cartridges and quantified by high-resolution capillary gas-chromatography with nitrogen-phosphorus detection (GC-NPD). The method was optimised for estuarine conditions. The recoveries varied significantly with the pH values of spiked seawater samples in the range pH 6.5–9.0 for both compounds. Salinity did not affect the recoveries of fenitrothion whereas the recoveries of dimethoate increased with salinity. The highest recoveries from water samples spiked at trace concentrations of 100 ng l?1 were 68% and 91% for dimethoate and fenitrothion, respectively, and were achieved at pH 6.5 and a salinity of 36‰. Recoveries from ultrasonically extracted sediments, spiked at 100 ng g?1 dry weight were 91% for dimethoate and 86% for fenitrothion. The detection limits (s/n = 3) for dimethoate and fenitrothion in water and sediment samples were 1 ng l?1 and 2 ng g?1 dry weight, respectively. The reproducibility (RSD) of all determinations was 10%. Comparison of the GC-EI-MS spectra showed that ions m/z 87,93 and 229 for dimethoate and m/z 109, 260 277 for fenitrothion are suitable for selective ion monitoring. The method was not suitable for extraction and quantification of dimethoxon, an oxygen analogue of dimethoate, as the recoveries were always below 20%. GC column lifetime was significantly improved after calibrations were performed with standard solutions prepared in OP-free extracts of natural samples.4.Comparison of Soxhlet and Microwave-Assisted Extractions for the Determination of Fenitrothion Residues in Beans Rokhaya G. Diagne, Gregory D. Foster, and Shahamat U. KhanJ. Agric. Food Chem., 50 (11), 3204 -3207Abstract:White and black "niebe" beans [Vigna unguiculata (L.) Walp] from Senegal were treated with fenitrothion (O,O-dimethyl O-4-nitro-m-tolyl phosphorothioate), and the residues were determined by high-performance liquid chromatography (HPLC) and electron capture gas chromatography (EC-GC). Fenitrothion residues from the beans were extracted by Soxhlet extraction (SE) and microwave-assisted extraction (MAE). A column cleanup procedure was used to remove the coextractives in the extract before HPLC and EC-GC analyses. The overall mean recoveries of fenitrothion residues in the 0.19-1.90 g/kg fortification range determined from extracts obtained by SE and MAE were 88.4 and 89.8%, respectively, with respective relative standard deviations of 4%. The results show that MAE is a viable alternative to the commonly used SE for the determination of fenitrothion residues in beans.

检测方法区别很大，不知从定义上来，如何阐述？