diff --git a/doc/handbook/dumux-handbook.bib b/doc/handbook/dumux-handbook.bib
index 7455bca77d8db3bfa35d243999bb7ec87c64d069..4e8ca0dbc545855749061c91c7a2fd0c833749fc 100644
--- a/doc/handbook/dumux-handbook.bib
+++ b/doc/handbook/dumux-handbook.bib
@@ -1929,3 +1929,27 @@ year={1999}
   title = {Accelerating the Uzawa Algorithm},
   journal = {{SIAM} Journal on Scientific Computing}
 }
+
+@article{Alanis2000,
+    author = {Elvio Alanis and Graciela Romero and Carlos C. Martinez},
+    title = {{Interferometric measurement of diffusion coefficients through a scanning laser beam}},
+    volume = {39},
+    journal = {Optical Engineering},
+    number = {3},
+    publisher = {SPIE},
+    pages = {744 -- 750},
+    year = {2000},
+    doi = {10.1117/1.602422},
+    url = {https://doi.org/10.1117/1.602422}
+}
+
+@article{Rard1979,
+    author = {Rard, Joseph A. and Miller, Donald G.},
+    title = {{The mutual diffusion coefficients of Na2SO4−H2O and MgSO4−H2O at 25°C from Rayleigh interferometry}},
+    volume = {8},
+    journal = {Journal of Solution Chemistry},
+    number = {10},
+    year = {1979},
+    doi = {10.1007/BF00648779},
+    url = {https://doi.org/10.1007/BF00648779}
+}
diff --git a/dumux/material/fluidsystems/brine.hh b/dumux/material/fluidsystems/brine.hh
index 98a55c712d7b01fec67d83023561cfa5a20c6140..7429f028da2b716165b75f59967b31896be08af5 100644
--- a/dumux/material/fluidsystems/brine.hh
+++ b/dumux/material/fluidsystems/brine.hh
@@ -440,6 +440,10 @@ public:
      * \param phaseIdx Index of the fluid phase
      * \param compIIdx Index of the component i
      * \param compJIdx Index of the component j
+     *
+     * The implemented value for NaCl is for a molar concentration of 2.5984 mol/l and a temperature of 25°C, see Rard and Miller, 1979 \cite Rard1979.
+     * Dependent on the salt concentration the coefficient can vary between 1.47e-9 m^2/s and 1.6e-9 m^2/s, see Rard and Miller, 1979.
+     * It also depends on temperature, values for different temparatures can e.g. found here: Alanis et al., 2000 \cite Alanis2000.
      */
     template <class FluidState>
     static Scalar binaryDiffusionCoefficient(const FluidState& fluidState,
@@ -454,11 +458,9 @@ public:
                 using std::swap;
                 swap(compIIdx, compJIdx);
             }
-            //! \todo TODO implement binary coefficients
-            // http://webserver.dmt.upm.es/~isidoro/dat1/Mass%20diffusivity%20data.pdf
-            // The link above was given as a reference in brine_air fluid system.
+
             if (compJIdx == NaClIdx)
-                return 0.12e-9;
+                return 1.54e-9;
             else
                 DUNE_THROW(Dune::NotImplemented, "Binary diffusion coefficient of components "
                                                  << compIIdx << " and " << compJIdx