Songet al., "Systematic synthesis and characterization of single-crystal lanthanide orthophosphate
nanowires," Journal of the American Chemical Society, vol.
In 2005, the surface water at the selected sites was monitored weekly for pH, dissolved oxygen, temperature, conductivity, transparency, nitrates, orthophosphates, and chlorophyll a.
Analysis for nitrates was performed by use of the cadmium reduction method 4500-NO3-E (APHA 1998), total reactive orthophosphates were analyzed following the U.S.
Dobson JW, Wells KL, Fisher CD (1970) Agronomic effectiveness of ammonium orthophosphate and ammonium polyphosphate as measured by ion uptake and yield of corn.
Godfrey CL, Fisher FL, Norris MJ (1959) A comparison of ammonium metaphosphate and ammonium orthophosphate with superphosphate on the yield and chemical composition of crops grown under field conditions.
Caption: Figure 9: Distribution of orthophosphates (a) and fluorine (b) in Sfax-Agareb groundwater.
The leachate has a very low pH (1.3) and high concentrations of fluoride (3500 mg/L), orthophosphate [H.sub.2]P[O.sub.4.sup.-] (6730 mg/L), and toxic elements (Cd, Cr, and Zn).
The lanthanide orthophosphates
, consisting of compounds with the stoichiometry Ln[PO.sub.4] where Ln represents any of the REE in the series extending from La to Lu (plus the related compounds [YPO.sub.4] and Sc[PO.sub.4]), are chemically durable and radiation resistant refractory materials.
However, a closer examination of the structures would reveal that all calcium orthophosphates
, listed here, can be included as distorted glaserite type structures, but with varying degrees of distortion.
Within 24 hours, one sample from each creek was measured for conductivity, nitrate, orthophosphate
, and pH levels using powder pillows and a Hach DR-2000 spectrophotometer (Stednick 1991; HACH Co.