【摘要】 新化合物1。3-N,N’-双-[4-（4’-硝基苯偶氮）苯基]异方酸二酰胺（BNBPS）的DMSO-H₂O溶液是阴离子HCO₃^-的良好显色剂.提供了一种用直接分光光度法分析HCO₃^-的新方法.试液的pH为7.8—9.5时,HCO₃^-与显色剂作用迅速,显色剂由红变蓝（△λ=108nm）,并有稳定的有色化合物生成（2h内吸光度不变）,λ_max=638nm,δ₆₃₈=2×104⁴ L·mol^-1·cm^-1,线性关系良好,显色剂选择性好,常见阳离子在较大范围内不显色,Cl^-,Br^-,I^一和NO₃^-在较大量范围内不干扰.更多还原

【Abstract】 Compound 1, 3-N, N-bis-4-（4’-nitro binzenediazo） phenyl squaraine （BNBPS） In DMS0-H₂O solution is a fine colour reagent for HCO₃^-1. A new method using spectrophotometric determination of HCO₃^-1 is developed. This compound reacts with HCO₃^-1 In DMSO-H₂O solution rapidly and forms a stable complex. The colour of solution is changed from red to blue （△λ=108nm） at pH 7.8-9.5 and the colour of system can remain for 2h. The maximum absor-ption is at 638nm with a molar absorptivity of 2xl0⁴L·mol^-1’cm^-1.The linear absorbance concentration relationship is held in 5—30μg/10mL HCO₃^-1. Common cations as well as anions, such as Cl^-, Br^-, I^-, and NO₃^-1, do not interfere within a wide concentration range.更多还原