COMPENSATION OF THE SCHLIEREN EFFECT IN FLOW-INJECTION ANALYSIS BY USING DUAL-WAVELENGTH SPECTROPHOTOMETRY

被引:99
作者
ZAGATTO, EAG
ARRUDA, MAZ
JACINTHO, AO
MATTOS, IL
机构
[1] Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, 13400 Piracicaba, SP
关键词
D O I
10.1016/S0003-2670(00)83550-3
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The Schlieren effect in flow-injection analysis is critically examined. Effects of sample constitution, injection volume, coil lengths, flow-rates, confluent stream addition and temperature are studied and practical implications in flow-injection design with and without the stopped-flow approach are discussed. For Schlieren compensation, a diode-array spectrophotometer is used and non-specific absorbance subtraction is exploited: the incident light passes through the flowing sample, the emergent light is dispersed, the intensities of two selected monochromatic beams are measured simultaneously by separate detectors and real-time subtraction of the wavelength-independent noise is achieved. The sensitivity and measurement precision improve after application of the subtraction algorithm. The potential, limitations and practical applications of the method are discussed. © 1990.
引用
收藏
页码:153 / 160
页数:8
相关论文
共 16 条
  • [1] [Anonymous], ADV CHEM SER
  • [2] NEW DEVICE FOR IMPROVING SENSITIVITY AND STABILIZATION IN FLOW-INJECTION ANALYSIS
    BERGAMIN, H
    REIS, BF
    ZAGATTO, EAG
    [J]. ANALYTICA CHIMICA ACTA, 1978, 97 (02) : 427 - 431
  • [3] BETTERIDGE D, 1978, ANALYST, V103, P897, DOI 10.1039/an9780300897
  • [4] FERREIRA JR, UNPUB ANALYST
  • [5] JACINTHO AO, 1989, QUIM NOVA, V12, P5
  • [6] RAPID-DETERMINATION OF SULFATE IN NATURAL-WATERS AND PLANT DIGESTS BY CONTINUOUS-FLOW INJECTION TURBIDIMETRY
    KRUG, FJ
    FILHO, HB
    ZAGATTO, EAG
    JORGENSEN, SS
    [J]. ANALYST, 1977, 102 (1216) : 503 - 508
  • [7] ZONE TRAPPING IN FLOW-INJECTION ANALYSIS - SPECTROPHOTOMETRIC DETERMINATION OF LOW-LEVELS OF AMMONIUM ION IN NATURAL-WATERS
    KRUG, FJ
    REIS, BF
    GINE, MF
    ZAGATTO, EAG
    FERREIRA, JR
    JACINTHO, AO
    [J]. ANALYTICA CHIMICA ACTA, 1983, 151 (01) : 39 - 48
  • [8] LANGE NA, 1967, HDB CHEM, P1383
  • [9] REIS BF, 1988, ANAL CHIM ACTA, V206, P253, DOI 10.1016/S0003-2670(00)80846-6
  • [10] Ruzicka J., 1988, FLOW INJECTION ANAL, Vsecond