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: 931  |  回复: 2

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

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

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
相关版块跳转 我要订阅楼主 mcfly2008 的主题更新
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 0703调剂,一志愿天津大学319分 +11 haaaabcd 2026-04-05 11/550 2026-04-06 09:36 by jp9609
[考研] 一志愿南京航空航天大学 材料与化工329分求调剂 +8 Mr. Z 2026-04-05 8/400 2026-04-06 09:24 by dongzh2009
[考研] 070300化学学硕311分求调剂 +11 梁富贵险中求 2026-04-04 13/650 2026-04-06 07:24 by houyaoxu
[考研] 315求调剂 +5 &123456789 2026-04-05 5/250 2026-04-05 19:55 by nepu_uu
[考研] 计算机11408,286分求调剂 +7 木子念晞 2026-04-05 7/350 2026-04-05 19:02 by chy09050039
[考研] 求调剂到0856材料工程 +3 程9915 2026-04-05 3/150 2026-04-05 18:15 by 蓝云思雨
[考研] 266分,一志愿电气工程,本科材料,求材料专业调剂 +8 哇呼哼呼哼 2026-04-02 9/450 2026-04-05 17:14 by lbsjt
[考研] 材料与化工363求推荐 +7 zh096 2026-04-04 7/350 2026-04-05 09:11 by 陌秋26
[考研] 288环境专硕,求调材料方向 +13 lllllos 2026-04-04 14/700 2026-04-04 23:34 by lqwchd
[考研] 268求调剂 +8 你好tg 2026-04-03 9/450 2026-04-04 05:08 by gswylq
[考研] 求调剂 +4 压力??大 2026-04-03 4/200 2026-04-03 21:36 by 啵啵啵0119
[考研] 数二英二348求调剂 +4 hxdzj1 2026-04-03 5/250 2026-04-03 21:25 by zhq0425
[考研] 301求调剂 +14 A_JiXing 2026-04-01 14/700 2026-04-03 18:31 by ls刘帅
[考研] 求调剂机会 +5 意染ivy 2026-04-03 5/250 2026-04-03 15:13 by qoooooo614
[考研] 求材料调剂 一志愿南昌大学 328分 +5 yyy..... 2026-04-03 5/250 2026-04-03 13:46 by 百灵童888
[考研] 303求调剂 +3 一色清羽 2026-04-02 4/200 2026-04-03 10:22 by 蓝云思雨
[考研] 0710生物学,325求调剂 +3 mkkkkkl 2026-04-01 3/150 2026-04-02 09:48 by Jaylen.
[考研] 材料调剂 +12 一样YWY 2026-04-01 12/600 2026-04-02 09:15 by olim
[考研] 302求调剂一志愿北航070300,本科郑大化学 +8 圣日耳曼条 2026-04-01 11/550 2026-04-02 07:40 by chemdavid
[考研] 085601一志愿西北工业大学初试346 +4 085601初试346 2026-03-30 4/200 2026-03-31 07:47 by jp9609
信息提示
请填处理意见