The paper also researched the sensitivity of phytoesterase extracted from different plant seeds on assaying organophosphate pesticides , and the limits of detection concentration ( ldc ) of five pesticides were determined 并且研究了不同来源的植物酯酶对有机磷农药的敏感性，确定了黄豆来源酯酶对敌敌畏等五种农药的最低检测限。
The limits of detection ( lod ) were relatively high , which might result in overestimating the heavy metal content , particularly among those food groups with the majority of food samples having metal concentrations below lod 此外，由于检测限( lod )相对较高，可能会高估重金属的含量，这尤见于样本中以低于检测限居多的食物类别。
Determination of the detection limit and decision threshold for ionizing radiation measurements - fundamentals and application to measurements by use of linear - scale analogue ratemeters , without the influence of sample treatment 电离辐射测量的检测限和判断阀的确定.在没有样品处理的影响下用模拟线性刻度辐射强度计测量的基本原理和方法
It was possible to detect 0 , p , m - bimethybenzen vapors and o , mp , - nitro - phenol in solutions down to ug l - 1 and umol ? l - 1 , respectively . the reaction between p - cd and guest molecules was investigated by the thermodynamic and kinetic methods 气相中，邻、间、对二甲苯的检测限为g ? l - 1 ，液相中对邻、间、对硝基酚的检测限也达到了mol
The quantitative determination of protein and dna is a common analysis contents in biology chemistry and life science . so it is very important to find fluorescence probe with high sensitivity and low detection limit 对蛋白质和dna进行定量测定是生物化学和生命科学中经常涉及的分析内容，建立高灵敏度、低检测限的荧光探针定量测定的方法仍具有重要意义。
15 . the lod for heavy metals for food surveillance and enforcement purpose were relatively high and would introduce uncertainties in exposure studies especially when a significant proportion of food samples had below lod concentrations 15 .因以监察食物和执法而设定的重金属检测限相对较高，因此如果大多数食物样本的重金属含量低于检测限，这便会影响摄入量研究的准确性。
This thesis consists of four chapters : ( 1 ) a review ; ( 2 ) study on the optical chemical membrane for detection of lead ion by using 2 - hydroxy - 1 - naphthaldehydene - 8 - aminoquinoline as fluorescence indicator ; ( 3 ) study on the optical chemical membrane for detection of lead ion by using meso - ( 4 - methyloxyphenyl ) porphyrin as fluorescence indicator ; ( 4 ) study on the optical chemical membrane for detection of lead ion by using 2 - methene - benzimidazole monoaza - 18 - crown - 6 as fluorescence indicator . in chapter one , the laboratory method for determination of lead ion , the progresses of chemical sensor for detection of lead ion recently and the introduction of the basic theory , relative merits of sol - gel and its application in optical chemical sensor were involved 第二章利用有机改性的溶胶-凝胶包埋方式,以2 -羟基- 1 -萘甲醛- 8 -氨基喹啉为荧光指示探针,结合正交实验方法探索了几个重要因素,如加水量、醇硅比、催化剂、添加剂等对成膜性的影响,制备了对水中铅离子有较好响应的传感膜,其线性范围为1 . 0 10 - 7 ~ 5 . 0 10 - 5mol / l ,检测限为3 . 6 10 - 8mol / l 。
Surface plasmon resonance immunosensor is a relatively new immunoassay technique and has been receiving more and more attention in recent years . however , a major disadvantage of spr for bioanalytical applications is that low concentration or low molecular mass analytes could not be detected directly . therefore , it is a challenging task to develop strategies for improving the detection limit sensitivity of spr . in this paper , authors present a novel strategy for improving the sensitivity of spr immunosensing using streptavidinbiotinylated antibody complex . it is proven that the amplification strategy causes a dramatic improvement of the detection sensitivity . this amplification strategy is based on the construction of a molecular complex between streptavidin and biotin labeled protein . the complex can be formed in a crosslinking network of molecules so that the amplification of response signal will be realized due to the big molecular size of complex 将链霉亲和素-生物素系统用于表面等离子体共振免疫传感的信号放大，实时检测了人免疫球蛋白g higg的蛋白浓度。发生免疫反应的传感片和生物素化抗体反应后，传感片表面的一层生物素分子随后与链霉亲和素-生物素化抗体复合物中的链霉亲和素的活性位点发生亲和反应，从而使传感片表面特异健合的物质质量显著增加，大大提高了免疫检测的灵敏度和检测限。免疫反应经放大后，可检测0 . 00510g ml浓度区间内的higg 。
In this thesis the in situ brilliant cresyl blue ( bcb ) dimer with weak fluorescence in the solution of anionic surfactant ( as ) sodium lauryl sulfonate ( sls ) was used as fluorescence probe . at the same time , the new method for the determination of bovine serum albumin ( bsa ) was built . the linear range was 0 - 7mg / l and the detection limit ( 3 o / k ) was 3 . 66 10 - 3 mg / l , the r . s . d for the determination of 2 . 00mg / l bsa was 2 . 77 % 本论文以阳离子染料灿烂甲酚蓝在阴离子表面活性剂十二烷基磺酸钠存在下形成的现场弱荧光二聚体为荧光探针，建立了测定牛血清白蛋白的新方法，该法线性范围为0 7mg / l ，检测限为3 . 66 10 ~ ( - 3 ) mg / l ，对2 . 00mg / l几的牛血清白蛋白平行测定8次，相对标准偏差为2 . 77 ，说明本法准确可靠。
