DET_Sample_Paper

磺基水杨酸差示分光光度法测定

不同含量铁的研究及应用

包桂兰1,刘青山2

(1.内蒙古师范大学地理系,内蒙古呼和浩特010022;2.内蒙古轻工业学校,内蒙古包头014000)

摘　要:研究了用磺基水杨酸显色,差示分光光度法测定不同含量铁的方法.在pH1.80—3.00的缓冲介质中,铁与磺基水杨酸生成紫红色络合物,表观摩尔吸光系数ε490为1.7×103L·mol-1·cm-1,铁含量在4.00—28.00mg·L-1(或16.00—40.00mg·L-1)范围内符合比耳定律.该法简便快速,选择性好,准确度高,测定范围广,适用于地质样、钢样中常量特别是高含量铁的测定.关键词:铁;磺基水杨酸;差示分光光度法中图分类号:O657.32　文献标识码:A　文章编号:1001-8735(2001)02-0139-03

关于差示分光光度法的原理、特点、实验技术条件等方面介绍的文献很多[1,2],以磺基

水杨酸显色光度法测定铁已有报道[3],但差示分光光度法测定常量铁未见报道.经典的常

量铁的分析是用重铬酸钾滴定法,而此法测定的废液中大量的Hg2Cl2和Cr3+将污染环境,

用差示分光光度法可克服一般分光光度法误差大和分析带来的污染等缺点.用此法测定地质样和钢样中的高、中含量铁,相对误差在±0.3%以内.

1　实验部分

1.1　仪器与试剂　721型分光光度计(上海第三分析仪器厂);pHS-3型数字式酸度计(天津第二分析仪器厂).

0.2000g·L-1Fe(Ⅲ)标准溶液:称取高纯铁0.1000g于小烧杯中,加硝酸(1+1)

10mL,加热溶解,煮沸除去氮的氧化物,冷却,移入500mL容量瓶中,以水稀释至刻度,摇匀;5%磺基水杨酸溶液;H3BO3-Na2B4O7缓冲溶液:pH9.0的Na2B4O7溶液和H3BO3饱

和溶液(1+1)混合配制;硝酸、盐酸、高氯酸:AR级;氢氟酸:ρ=1.13.

所用试剂均为分析纯,实验用水为二次蒸馏水.

1.2　实验方法　移取一定量的Fe(Ⅲ)标准溶液于25mL容量瓶中,加2.00mL5%磺基水杨酸,10mLH3BO3-Na2B4O7缓冲溶液,用水稀释至刻度,摇匀.以0.100mg(或

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液相专用词汇中英文对照表

积分型检测器 in tegrat ing detector 激光光热检测器 laser and light

heat detector 激光解吸质谱法 laser desorption MS ， LDMS 激光裂解器laser pyrolyzer 激光色谱 laser chromatography 激光诱导光热光偏转测量 detection of laser- induced light heat

激光诱导光束干涉检测 detection of laser-i nduced light beam I

激光诱导毛细管振动测量 laser- reduced capillary vibratio n det

激光诱导荧光检测器 laser- in duced fluoresce nee detector

记忆峰 memory peak 记忆效应 memory effect 夹层槽 sandwich

chamber 假峰 ghost peak

间断洗脱色谱法 in terrupted-elutio n chromatography

间接光度（检测）离子色谱法 in direct photometric ion chromato

间接光度（检测）色谱法 in direct photometric chromatography

间接检测 in direct detecti on 间接荧光检测 in direct fluoresce nce

detect ion 间接紫外检测 in direct ultraviolet detectio n 检测器detector 检测器检测限 detector detectability 检测器灵敏度 detector

sensitivity 检测器线性范围 detector lin ear range 碱火焰电离检测器

alkali flame io ni zatio n detector ， AFID 碱洗法 alkali wash 剪纸称重法 cut-paper weighing method 减尾剂 tailing reducer 减压液相色谱 vacuum liquid chromatography 键合固定相 bon ded stati onary

polyphonic ringtone

和弦铃声 chord music ringtone 对讲机 Walkie-Talkie

全球定位系统 GPS （Global Positioning System）

高保彩铃真 high fidelity（常简写为hi-fi）

移动梦网 Monternet（Mobile+Internet）

短信服务SMS（Short Message Service）

彩信服务 MMS（Multimedia Message service）

客户身份识别卡 SIM卡（Subscriber Identity Module）

全球移动通信系统 GSM (Global System For Mobile Communications)

储值卡 pre-paid phone card

语音提示 voice prompt

直板手机 bar phone

翻盖手机 clamshell phone /flip phone

滑盖手机 slide phone

翻盖接听 flip answer

按键 keypad

按键音 keypad tone

提示音 warning tone

手机充值 cellular phone replenishing/recharging

手机入网费 initiation charges for mobile phone; mobile access fee

漫游 roaming service

手机用户 mobile phone user/subscriber

短信 short message; text message

图片短信 picture message

手机费 mobile phone fee

关机 power off

手机铃音 mobile phone ringtone

振动 vibrate

手机实名制 mobile phone identification policy