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【討論】探討水質(zhì)監(jiān)測(cè)有效數(shù)字問題 已有2人參與
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各位蟲友好,我有個(gè)文章投Hydrological Processes修了2次了,審稿人最后提了一個(gè)問題,是關(guān)于數(shù)據(jù)的有效數(shù)字的問題,不知道大家有沒有碰上過,先發(fā)審稿意見。 Please use appropriate significant digits when reporting numbers. Many authors, including you, report discharge, concentrations, percentages (,e.g. line 242), r2 (e.g. lines 243 & 244), fluxes, rainfall, area, volumes, and etcetera to more digits than can be supported by the precision of the measured or modeled result. For most cases, numbers should be only reported to less than 2 significant digits, which would be associated with a precision of 1%. The evaluation of long-term method precision for analytical determinations of water samples indicates that the precision is typically less than 15% but generally no better than 5% for any analyte (1 or 2 significant digits) and likewise for discharge data (the best reported measurement precision for USGS discharge is 5%). Please correct these throughout the manuscript including Table II (e.g. EC with 5 sign. digits and several others to 3) – ask yourself if you can justify precision to the level that you report it. 比如他提到的EC,我的數(shù)值是76.90, 524.90, 247.46 其他的如總氮的數(shù)值是0.49,3.04,1.15 我的初衷是保留小數(shù)點(diǎn)后2位,如果按照他的意見最多2位有效數(shù)字,524.90豈不是要表示成5.4X102方,這表達(dá)是不是有點(diǎn)滑稽? 有沒有蟲友碰到過這種情況,請(qǐng)指教 |
至尊木蟲 (職業(yè)作家)
快樂家族新人
木蟲 (職業(yè)作家)
船長
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二樓的解釋不妥當(dāng)。 環(huán)境監(jiān)測(cè)數(shù)據(jù)的有效位數(shù)應(yīng)當(dāng)遵循國家的規(guī)范,而不是作者想當(dāng)然應(yīng)該取多少位。 地表水和污水監(jiān)測(cè)技術(shù)規(guī)范(HJ/T91-2002) http://www.sepa.gov.cn/image20010518/3589.pdf 比如電導(dǎo)率(EC),單位為us/cm,最多有效數(shù)字取3位,小數(shù)點(diǎn)后最多留一位,大數(shù)值采用科學(xué)計(jì)數(shù)法。 總氮:最多有效數(shù)字取3位,小數(shù)點(diǎn)后最多留2位。 中國的環(huán)境監(jiān)測(cè)方法大多來自美國EPA標(biāo)準(zhǔn),你可以找出相應(yīng)的EPA方法中的有效數(shù)字規(guī)定,答復(fù)審稿人。 |

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