ABSTRACT
The SASMIT protocol, based on the linkage between dissolved arsenic (As) concentrations and color of sediments in the screened zone, has been developed during an As study in Matlab in southeast Bangladesh during 2005–2009. The current study aims at applying the same protocol in three diverse geological environments in Bangladesh, viz. Gowainghat in the northeast piedmont plain; Daudkandi in the Meghna flood plain and Assassuni in the Ganges deltaic plain. Detail sediment characterization from targeted depths at different drilling locations and creation of a digital platform has been assessed to unravel the potentials for application of the SASMIT protocol i.e. the wells in oxidized layers and intermediated depth aquifers with grey to light grey sediments are showing low arsenic concentrations. The digital platform was implemented during this intervention period and acted as a decision making tool as well as data capturing and preservation platform. The drillers and implementing agencies in installing public water supply wells at safe aquifers; this would also support decision makers to propose alternative water supply options other than tubewells in regions with high As in shallow and deep aquifer. Implementations of the approach combined with ASU of UNICEF-DPHE can improve safe water access in Bangladesh significantly.
