瑞士万通ADI 2045 在线伏安极谱仪

镧离子掺杂类普鲁士蓝复合汞膜电极的制备及电分析测定铅

迄今汞膜电极仍被广泛地应用在负电位区间的电位窗宽，可与许多金属生成汞齐等用于环境样品中定量检测痕量、超痕量重金属离子及有电氧化还原特性的生化物质． 玻碳汞膜电极( GC /MFE) 或金属汞膜电极表面上的汞常由于不同的分布状态，膜上负载的汞量会随着测定次数增加而损耗，影响测定数据的重复性和分析结果的重现性．尝试以不同的方法改进汞膜的组装，构建化学修饰型复合汞膜电极并用于痕量重金属的溶出法测定，以多核氰桥无机导电聚合物为内膜修饰层的复合汞膜电极是有效的手段之一． 无机多核过渡金属氰桥化合物的类普鲁士蓝( PB) 材料以其包含［Fe( CN)6］3 － /［Fe( CN)6］4 － 优良电子传递能力的氧化还原电子对，同时有类似于有机聚合物的三维网状结构、化学稳定性好、制备简单和成本低的特点．拟以玻璃碳基电极( GC) 为基底，分别制备镧离子和钴离子掺杂类普鲁士蓝修饰的复合汞膜电极，并与直接在基底表面镀汞膜( GC/MFE) 对比，期能筛选出稳定性、灵敏度以及抗有机共存物污染能力得到明显改善，可应用于微量Pb2 + 测定的新型复合汞膜电极．

伏安极谱法测定盐水和氢氧化钠中的镉、铅、铜

Cadmium, lead and copper: Electrolyte: Acetate buffer, pH = 4.6 (CH3COOH/NH3) AE: Pt RE: Ag/AgCl/KCl 3M Parameters: DPASV (+50 mV), HMDE Umeas = –700 mV (90s), Ustart = –700 mV, Uend = +30 mV Ep (Cd) = –600 mV, Ep (Pb) = –380 mV Ep (Cu) = –120 mV

伏安极谱法测定单质硫中的锌、镉、铅、铜、铁、镍、钴

Zinc, cadmium and lead: Electrolyte: KCl/NaCH3COOH buffer AE: Pt RE: Ag/AgCl/KCl 3M Parameters: DPASV (+50 mV), HMDE Umeas = -1150 mV (90s), Ustart = -1150 mV, Uend = -150 mV Ep (Zn) = -960 mV, Ep (Cd) = -580 mV Ep (Pb) = -375 mV

利用MME和UTGE电极测定盐水中的铬

Chromium at the MME: Electrolyte: Acetic acid, ethylenediamine, NH3 pH = 6.8 with NaOH or HCl AE: Pt RE: Ag/AgCl/KCl 3M Parameters: DP polarography (-50 mV), SMDE Ustart = +80 mV, Uend = -170 mV Ep (Cr(VI)) = -50 mV

伏安极谱法测定氢氧化钠中的锌、镉、铅、铜、铁、镍、钴

Zinc, cadmium, lead and copper: Electrolyte: Acetate buffer, pH = 4.6 with CH3COOH, NH3 and HCl. AE: Pt RE: Ag/AgCl/KCl 3M Parameters: Zn at the SMDE, Ustart = -800 mV, Uend = -1200 mV Cd, Pb and Cu at the HMDE, DPASV (+50 mV) Umeas = -700 mV (90s), Ustart = -700 mV, Uend = +30 mV Ep (Zn) = -960 mV, Ep (Cd) = -600 mV Ep (Pb) = -380 mV, Ep (Cu) = -120 mV

伏安极谱法测定盐水中的汞

Mercury: Electrolyte: Primary solution consists of NaCl, HClO4 suprapur, EDTA AE: GC RE: Ag/AgCl/LiCl 3M (internal standard) // primary solution (external standard) Parameters: DPASV (+50 mV), Au–RDE Umeas =1500 mV (30s), Umeas = 370 mV (120s), Umeas = 500 mV (5s) without stirring, Ustart = 500 mV, Uend = +840 mV Ep (Hg) = +640 mV

伏安极谱法测定盐水中的总砷

Arsenic: Electrolyte: HCl, 30% AE: Pt (special intermediate electrolyte vessel required) RE: Ag/AgCl/KCl 3M Parameters: DPASV (+50 mV), special Au-RDE Umeas = –1200 mV (60s), Umeas = –200 mV (10s), Umeas = – 200 mV (15s) without stirring, Ustart = –200 mV, Uend = + 300 mV Ep (As) = + 150 mV

伏安极谱法测定乙酸中的镉、铅、锑

伏安极谱法测定乙酸中的镉、铅、锑应用简报 Cadmium and lead: Electrolyte: NaCH3COO AE: Pt RE: Ag/AgCl/KCl 3M Parameters: DPASV (+50 mV), HMDE Umeas = –800 mV (90s), Ustart = –800 mV, Uend = –200 mV Ep (Cd) = – 560 mV, Ep (Pb) = –400 mV Antimony detection in the same vessel: Electrolyte: HCl 30% AE: Pt RE: Ag/AgCl/KCl 3M Parameters: DPASV (+50 mV), HMDE Umeas = –400 mV (180s), Ustart = –450 mV, Uend = –70 mV Ep (Sb) = –150 mV

单壁碳纳米管复合膜电极电催化氧化山莨菪碱

制备以水作为分散剂的单壁碳纳米管—刚果红（ＳＣＮＴＷｓ－ＣＲ）的化学修饰电极，研究山莨菪碱在该修饰电极上的电化学行为和电化学动力学性质．结果表明：该修饰剂对山莨菪碱的氧化具有显著的电催化作用；山莨菪碱的氧化过程是一个不可逆的双电子双质子过程，其在该修饰电极上的扩散系数、速率常数分别为６.４９×１０－２ｃｍ２／ｓ，６.５２×１０－３ｍｏｌ／（Ｌ?ｓ）．基于实验优化分析条件，建立直接测定山莨菪碱的电化学定量分析方法，该方法的线性范围为１.７３×１０－５～５.１７×１０－５ ｍｏｌ／Ｌ和６.３１×１０－５ ～１.１４×１０－４ ｍｏｌ／Ｌ，检出限为１.７４×１０－６ｍｏｌ／Ｌ，同支电极的相对标准偏差（ＲＳＤ）为３.６６!．该方法也可用于山莨菪碱的含量测定．