24小时热门版块排行榜    

北京石油化工学院2026年研究生招生接收调剂公告
查看: 925  |  回复: 2
当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖

mcfly2008

新虫 (初入文坛)

[求助] 关于检出限,如何折算到样品中去? 已有1人参与

最近投了一篇稿件,关于ICP-MS测定多元素的,审稿意见关于LOD的,以前认为算出仪器的LOD,然后折算回样品(按定容体积,称样量),就是方法的LOD,万万没想到,审稿人给了我意见如下:

However, calling it a limit of detection is not a correct use of terminology.  LOD is an instrumental terminology, it does not refer to samples.  I think you should probably find another way to explain it.

请问我该怎么想办法,折算到样品去呢?
回复此楼
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

51658173

新虫 (小有名气)

引用回帖:
2楼: Originally posted by klicking at 2014-10-16 09:28:23
可以参考:通过几份空白样品的分析,然后计算其响应值的标准差,测出分析背景响应值的大小。
(ICH Q2(R1):6.3        Based on the Standard Deviation of the Response and the Slope
The detection limit (DL) may ...

请问,标准偏差是根据多次测量的响应值自己计算出来的吗,还是把标曲中的截距作为平均值,再乘以标曲旁边表格中0浓度对应的RSD值,作为标准偏差呢?
3楼2016-12-23 21:29:11
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 3 个回答

klicking

至尊木虫 (著名写手)

【答案】应助回帖

感谢参与,应助指数 +1
可以参考:通过几份空白样品的分析,然后计算其响应值的标准差,测出分析背景响应值的大小。
(ICH Q2(R1):6.3        Based on the Standard Deviation of the Response and the Slope
The detection limit (DL) may be expressed as:
DL =        3.3 σ/S
where        σ = the standard deviation of the response
                S = the slope of the calibration curve
The slope S may be estimated from the calibration curve of the analyte. The estimate of σ may be carried out in a variety of ways, for example:
6.3.1        Based on the Standard Deviation of the Blank
Measurement of the magnitude of analytical background response is performed by analyzing an appropriate number of blank samples and calculating the standard deviation of these responses.
6.3.2        Based on the Calibration Curve
A specific calibration curve should be studied using samples containing an analyte in the range of DL. The residual standard deviation of a regression line or the standard deviation of y-intercepts of regression lines may be used as the standard deviation.
归零
2楼2014-10-16 09:28:23
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 300求调剂,材料科学英一数二 +9 leaflight 2026-03-24 9/450 2026-03-29 14:18 by wxiongid
[考研] 一志愿南昌大学324求调剂 +3 hanamiko 2026-03-29 3/150 2026-03-29 14:17 by 无际的草原
[考研] 334分 一志愿武理 材料求调剂 +5 李李不服输 2026-03-26 5/250 2026-03-29 13:40 by 唐沐儿
[考研] 275求调剂 +10 Micky11223 2026-03-25 15/750 2026-03-29 13:30 by Micky11223
[考研] 081200-11408-276学硕求调剂 +6 崔wj 2026-03-26 6/300 2026-03-29 01:11 by hanserlol
[考研] 化学0703 调剂 306分 一志愿211 +4 26要上岸 2026-03-28 4/200 2026-03-28 15:30 by 1018329917
[考研] 317求调剂 +6 十闲wx 2026-03-24 6/300 2026-03-28 13:27 by Iveryant
[考研] 085600 286分 材料求调剂 +7 麻辣鱿鱼 2026-03-27 8/400 2026-03-28 12:17 by zllcz
[考研] 086502化学工程342求调剂 +6 阿姨复古不过 2026-03-27 6/300 2026-03-28 07:06 by wangy0907
[考研] 265求调剂 +8 小木虫085600 2026-03-27 8/400 2026-03-27 22:16 by 无际的草原
[考研] 安徽大学专硕生物与医药专业(086000)324分,英语已过四六级,六级521,求调剂 +4 美味可乐鸡翅 2026-03-26 4/200 2026-03-27 15:27 by 星空星月
[考研] 085601 材料工程 313分 求调剂 +5 Ong3 2026-03-27 5/250 2026-03-27 12:24 by goldfish51
[考研] 调剂推荐 +5 清酒714 2026-03-26 6/300 2026-03-27 11:12 by 不吃魚的貓
[论文投稿] Journal of Mechanical Science and Technology +3 Russ_ss 2026-03-25 5/250 2026-03-27 10:49 by 陆小果画大饼
[考研] 求调剂 一志愿 本科 北科大 化学 343 +6 13831862839 2026-03-24 7/350 2026-03-26 22:57 by 不吃魚的貓
[考研] 321求调剂 +6 wasdssaa 2026-03-26 6/300 2026-03-26 20:57 by sanrepian
[考研] 化学工程085602 305分求调剂 +17 RichLi_ 2026-03-25 17/850 2026-03-26 19:44 by plmuchong
[考研] 080500求调剂 +3 zzzzfan 2026-03-24 3/150 2026-03-24 16:38 by barlinike
[考研] 344求调剂 +3 desto 2026-03-24 3/150 2026-03-24 10:09 by 搏击518
[考研] 石河子大学(211、双一流)硕博研究生长期招生公告 +3 李子目 2026-03-22 3/150 2026-03-22 21:01 by 怎么释怀
信息提示
请填处理意见