Boron fresh water

Ahl, T. and E. Jonsson. 1972. Boron in Swedish and Norwegian fresh waters. Ambio 1 66-70. 

Goldschmidt and Peters (1932) were also the first to note the high concentration of boron in seawater (4.5 ppm) as opposed to its low content in fresh waters (10 ppb in average river, Lemarchand et al, 2002). This contrast served as a basis for the numerous attempts to use boron content as a paleosalinity proxy (see Lerman, 1966 Walker, 1968), again primarily utilizing clays as the indicator phase. 

Kolodny Y., Tarablous A. and Frieslander U. (1980) Participation of fresh water in chert diagenesis—evidence from stable isotopes and boron a-track mapping. Sedimentology 27, 305-316. 

C for 3 h under vacuum) and freshly distilled dichloromethane (2 ml). With stirring at - 20°C, freshly distilled boron trifluoride etherate (0.037 ml, 0.3 mmol) was added dropwise. After the appropriate time the reaction mixture was quenched with water and extracted with hexane. The organic extracts were washed with brine, dried and concentrated to give an oily residue which was purified by preparative TLC. The yields of o-iodopropargylarenes were in the range 51-90%. 

Boron Trichloride Chemical goggles, rubber protective clothing and gloves. Remove to fresh air, give oxygen or apply artificial respiration. Wash off with plenty of water. Wash with plenty of water for at least 15 minutes. 

Boron does not represent any health hazard if present at the concentrations occurring in clean surface and fresh groundwaters. However, its presence is not suitable in irrigation waters as it inhibits the growth of plants. Therefore, the concentration of boron in these waters should be limited to values ranging from 0.5-2.0 mg 1 ... 

In the event of skin contact, immediately wash with soap and water and remove contaminated clothing. In case of eye contact, promptly wash with copious amounts of water for 15 min (lifting upper and lower lids occasionally) and obtain medical attention. If boron trifluoride is inhaled, move the person to fresh air and seek medical attention at once. If this eompound is ingested, obtain medical attention immediately. 

---