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α、β、γ、δ四（四－三甲铵基卟啉）简称为ＴＡＰＰ，是一种超高灵敏度有机试剂，测汞的最低浓度为１．０×１０（－８）ｍｏｌ．ｃ（－１），桑德尔灵敏度为１．６×１０（－２）ｎｇ．ｃｍ（－２）．在室温条件下锰（Ⅱ）与此试剂的反应很慢，一旦有汞（Ⅱ）存在，则发生催化一络合置换反应．经实验，在ｐＨ＝６．９，４０～６５℃催化效应好．试样经硝酸－硫酸湿法消解后，采用巯基棉分离富集，选用６～８ｍｌ．０ｍｏｌ·Ｌ（－１）ＨＣｌ淋洗，然后按实验方法，于４１１ｎｍ波长处，测定得到田螺中汞量的平均值为０．０８９５ｍｇ／ｋｇ．加入回收率８４．８％．
Alpha, beta, gamma, delta tetrakis (tetrakis trimethylammonium porphyrin), abbreviated as TAPP, is an ultra-sensitive organic reagent with the lowest concentration of 1.0 × 10 -8 mol. The sensitivity of Sander was 1.6 × 10 (-2) ng for c (-1). cm (-2). The reaction of manganese (II) with this reagent is very slow at room temperature. Once mercury (II) is present, a catalytic complex reaction occurs. After experiments, the pH value of 6.9, 40 ~ 65 ℃ good catalytic effect. Sample by nitric acid - sulfuric acid wet digestion, the use of mercapto cotton separation and enrichment, the selection of 6 ~ 8ml. 0 mol·L (-1) HCl rinse, and then by experimental methods, measured at 411nm wavelength, the average amount of mercury obtained snail was 0.0895mg / kg. The recovery rate of 84.8%.