国际沙棘研究与开发
國際沙棘研究與開髮
국제사극연구여개발
THE GLOBAL SEABUCKTHORN RESEARCH AND DEVELOPMENT
2012年
2期
8-12
,共5页
沙棘维生素P粉%测量不确定度评估%原子吸收光谱石墨炉法%铅
沙棘維生素P粉%測量不確定度評估%原子吸收光譜石墨爐法%鉛
사극유생소P분%측량불학정도평고%원자흡수광보석묵로법%연
Seabuckthorn vitamin P powder%uncertainty evaluation%graphite furnace atomic absorp-tion spectrometry%lead content.
随机选取青海省生产的沙棘维生素P粉样品,用原子吸收分光光度计石墨炉法测定样品中铅含量,参考《化学分析中测量不确定度的评估指南》的方法,分析铅含量测定过程中的测量不确定度的主要来源,包括溶液定容体积、称量、样品溶液铅浓度测定和测量重复性,计算合成不确定度和扩展不确定度。在该样品铅含量测定中,沙棘维生素P粉样品中铅含量为0.96mg/kg,其扩展不确定度为0.11mg/kg(置信度95%,包含因子K=2)。
隨機選取青海省生產的沙棘維生素P粉樣品,用原子吸收分光光度計石墨爐法測定樣品中鉛含量,參攷《化學分析中測量不確定度的評估指南》的方法,分析鉛含量測定過程中的測量不確定度的主要來源,包括溶液定容體積、稱量、樣品溶液鉛濃度測定和測量重複性,計算閤成不確定度和擴展不確定度。在該樣品鉛含量測定中,沙棘維生素P粉樣品中鉛含量為0.96mg/kg,其擴展不確定度為0.11mg/kg(置信度95%,包含因子K=2)。
수궤선취청해성생산적사극유생소P분양품,용원자흡수분광광도계석묵로법측정양품중연함량,삼고《화학분석중측량불학정도적평고지남》적방법,분석연함량측정과정중적측량불학정도적주요래원,포괄용액정용체적、칭량、양품용액연농도측정화측량중복성,계산합성불학정도화확전불학정도。재해양품연함량측정중,사극유생소P분양품중연함량위0.96mg/kg,기확전불학정도위0.11mg/kg(치신도95%,포함인자K=2)。
According to The Guide of Uncertainty Evaluation for Measurement of Chemical Analysis, some samples of seabuckthorn vitamin P powder are randomly selected in Qinghai and its' lead content was determined by graphite furnace atomic absorption spectrometry (GFAAS) . The main sources to measurement results include preparation of various chemical solutions, sample weighting, the certified values of standard referenced materials and the instruments stability and etc. The total uncertainty for lead determinations by GFAAS was combined and calculated. In this analysis, the expanding uncer- tainty is 0.11mg/Kg with lead content 0.96mg/Kg.