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1.分析天平在使用前沒有經過校準
一(yi)台(tai)分(fen)析(xi)天(tian)平(ping)在(zai)使(shi)用(yong)之(zhi)前(qian)，首(shou)先(xian)要(yao)確(que)認(ren)它(ta)的(de)正(zheng)確(que)性(xing)是(shi)否(fou)合(he)格(ge)，否(fou)則(ze)該(gai)天(tian)平(ping)所(suo)稱(cheng)量(liang)的(de)正(zheng)確(que)性(xing)得(de)不(bu)到(dao)保(bao)證(zheng)。分(fen)析(xi)天(tian)平(ping)從(cong)首(shou)次(ci)使(shi)用(yong)起(qi)，應(ying)對(dui)其(qi)定(ding)期(qi)校(xiao)準(zhun)。連(lian)續(xu)使(shi)用(yong)的(de)天(tian)平(ping)，大(da)約(yue)每(mei)星(xing)期(qi)校(xiao)準(zhun)一(yi)次(ci)。校(xiao)準(zhun)時(shi)應(ying)按(an)規(gui)定(ding)程(cheng)序(xu)進(jin)行(xing)，必(bi)須(xu)使(shi)用(yong)標(biao)準(zhun)砝(fa)碼(ma)進(jin)行(xing)校(xiao)準(zhun)，否(fou)則(ze)將(jiang)起(qi)不(bu)到(dao)校(xiao)準(zhun)的(de)作(zuo)用(yong)。
2.分析天平安裝不正確
在安裝分析天平時首先要選擇選防塵、防潮、防震、防風、防曬、恒heng溫wen的de房fang間jian作zuo為wei天tian平ping室shi。其qi次ci，天tian平ping應ying安an放fang在zai牢lao固gu可ke靠kao的de工gong作zuo台tai上shang，並bing選xuan擇ze適shi當dang的de位wei置zhi安an放fang。天tian平ping安an裝zhuang前qian，應ying按an裝zhuang箱xiang清qing單dan進jin行xing清qing點dian，看kan各ge部bu件jian是shi否fou齊qi全quan、wanhao，bingduitianpingdesuoyoubujianjinxingzaixiqingjie。anzhuangshi，yingcanzhaotianpingdeshuomingshuzhengquezhuangpeitianping。anzhuangwanbihouyingzaicijianzhagebufenanzhuangshifouzhengchang，ranhoujianzhadianyuandianyashifoufuhetianpingdeyaoqiu，dakaitianpingjianzhashifouzhengchang。
3.環境及樣品的物理因素影響
在使用分析天平進行稱量的過程中，環境和物理因素會對稱量結果產生幹擾，如溫度、樣品揮發、吸濕、磁力、靜電等的幹擾。
（1）溫wen度du的de變bian化hua對dui分fen析xi天tian平ping的de影ying響xiang如ru果guo在zai稱cheng量liang過guo程cheng中zhong發fa現xian顯xian示shi值zhi單dan方fang向xiang漂piao移yi，就jiu有you可ke能neng是shi溫wen度du變bian化hua所suo產chan生sheng的de影ying響xiang。若ruo樣yang品pin與yu周zhou圍wei環huan境jing之zhi間jian的de溫wen度du存cun在zai差cha異yi，則ze這zhe個ge溫wen度du差cha異yi就jiu會hui導dao致zhi沿yan稱cheng重zhong容rong器qi流liu動dong的de氣qi流liu。空kong氣qi沿yan著zhe容rong器qi外wai側ce流liu動dong產chan生sheng一yi個ge向xiang上shang的de作zuo用yong力li，這zhe個ge力li就jiu導dao致zhi稱cheng重zhong結jie果guo產chan生sheng錯cuo誤wu：yangpinzaidongtaifulizuoyongxia，chengdedezhongliangbishijiyaoqing。zhegezuoyongzhidaowendupinghengxingchengyihoucaihuizhongzhi。dangbayangpincongganzaoluhuobingxiangzhongquchuyihou，yaodengdaoyangpinwenduyushiyanshihuochengliangshiwenduyizhishicaikeyichengliang。yangpinyaofangzaibiaomianjijinkenengxiaodequpirongqizhong，qufangchengliangrongqiyaoshiyongniezijiaqu，erbunengjiangshoufangruchengliangshizhong。
（2）yangpinxishihuohuifaduichengliangjieguodeyingxiangruguozaichengliangdeguochengzhongxianshizhidanfangxiangchixupiaoyi，zekenengceliangdeshihuifaxinghuoxishixingyangpin。ruoyangpinxishixingjiaoqiang，zezhonglianghuizengda；若(ruo)被(bei)測(ce)量(liang)樣(yang)品(pin)屬(shu)易(yi)揮(hui)發(fa)物(wu)質(zhi)，則(ze)重(zhong)量(liang)會(hui)減(jian)小(xiao)。對(dui)於(yu)吸(xi)濕(shi)性(xing)或(huo)揮(hui)發(fa)性(xing)樣(yang)品(pin)可(ke)使(shi)用(yong)細(xi)頸(jing)容(rong)器(qi)，給(gei)容(rong)器(qi)加(jia)蓋(gai)或(huo)上(shang)塞(sai)，使(shi)用(yong)清(qing)潔(jie)幹(gan)燥(zao)的(de)稱(cheng)重(zhong)容(rong)器(qi)並(bing)保(bao)持(chi)稱(cheng)盤(pan)上(shang)不(bu)粘(zhan)有(you)灰(hui)塵(chen)、汙染物及水滴。（3）樣yang品pin或huo容rong器qi帶dai靜jing電dian對dui稱cheng量liang結jie果guo的de影ying響xiang如ru果guo每mei次ci稱cheng量liang都dou顯xian示shi不bu同tong的de稱cheng量liang結jie果guo或huo顯xian示shi值zhi不bu穩wen定ding，或huo稱cheng量liang結jie果guo的de重zhong複fu性xing差cha，則ze可ke考kao慮lv是shi稱cheng量liang容rong器qi或huo者zhe樣yang品pin帶dai有you靜jing電dian。靜jing電dian現xian象xiang的de影ying響xiang將jiang使shi每mei次ci稱cheng量liang時shi稱cheng重zhong容rong器qi均jun顯xian示shi不bu同tong的de重zhong量liang，結jie果guo的de重zhong複fu性xing很hen差cha。具ju有you高gao絕jue緣yuan度du的de材cai料liao如ru玻bo璃li、suliaozhidechengzhongrongqidengrongyidaijingdian。zhezhongdaidianxianxiangzhuyaoshiyouyuyangpinhuorongqizaibanyunguochengzhongjiaobanhuomocachanshengde，erqieyidandaidianzepaichudianhehuifeichanghuanman，zaixiangduishidudiyu40%deganzaokongqizhongchuxianyangpinhuorongqidaijingdiandejilvhuizengjia。tongchangkecaiyongdakaijiashiqihuoshidangtiaojiekongtiaoxitonglaizengjiakongqishidu，bachengzhongrongqifangzaijinshurongqineizaijinxingchengliang，shefageifenxitianpingjiedidengcuoshi，laiquchuhuopingbichengzhongyangpinshangdejingdian。
4.使用者操作不當造成稱量不準確
稱量前沒有檢查，盲目稱量。稱量前應檢查天平是否正常，天平是否水平，稱盤是否潔淨、顯示屏是否歸零“000”位等。
文章來源：網絡
